EC76-Electronics System Design Lab

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EINSTEINCOLLEGE OF ENGINEERINGSir.C.V.Raman Nagar, Tirunelveli-12

Department of Electronics and Communication

Engineering

Subject Code: EC-76

“ELECTRONIC SYSTEM DESIGN LAB”

Name : ……………………………………

Reg No : ……………………………………

Branch : ……………………………………

Year & Semester : ……………………………………



EC-76 ESD LAB MANUAL

©Einstein College of Engineering of 80

LIST OF EXPERIMENTS

Exp.No Name of the experiment Page No

1 DESIGN OF AN INSTRUMENTATION AMPLIFIER

2 DESIGN OF AC/DC VOLTAGE REGULATOR USING SCR

3 DESIGN OF PROCESS CONTROL TIMER

4 i) DESIGN OF AM MODULATOR AND DEMODULATOR

ii) DESIGN OF FM MODULATOR AND DEMODULATOR

5 DESIGN OF WIRELESS DATA MODEM

6 PCB LAYOUT DESIGN USING CAD TOOL

7 MICROCONTROLLER BASED SYSTEMS DESIGN

8 DSP BASED SYSTEM DESIGN

9 PSUEDO RANDOM SEQUENCE GENERATOR

10 ARITHMETIC LOGIC UNIT DESIGN





INDEX

EX.No DATE NAME OF EXPERIMENT PAGE No MARKS INITIAL





Ex. No.1 DESIGN OF AN INSTRUMENTATION AMPLIFIER

AIM:To design, construct and test an instrumentation amplifier using IC 741 and vary its gain

from 1 to 100.

APPARATUS REQUIRED:

S.No Name of the Apparatus Range Quantity

1 Operational Amplifier IC 741 4

2 Resistor 10k

1k

150

1041

3 DRB 1

4 Bread Board&Connecting wires

As required

5 Dual Power Supply 1

6 Rheostat (0-100) 1

7 Ammeter (0-250)µA 1

8 Multimeter 1

THEORY:

INSTUMENTATION AMPLIFIER:Instrumentation amplifier is generally required in any measurement system

using electrical transducers to enhance signal levels often in low voltage less than mV. Alsoit is required to provide impedance matching and isolation. When the desired input rides overa common mode signal special amplifier are needed so that difference signals get amplifiedto an acceptable level while the common mode signals get attenuated.

The physical quantities can be converted into electrical quantities by usingtransducer. The output of the transducer needs to be amplified to get the meter readings. Thisamplification is done by using instrumentation amplifier. The output of instrumentationamplifier drives of indicator or display system. The important features of an instrumentationamplifier are high gain accuracy, high CMRR, high gain stability with low temperatureco-efficient, low dc offset, low output impedance.

Low input impedance may load the signal source heavily. Therefore high resistancebuffer is used preceding each input to avoid this loading effect. For V1 =V2 under commonmode condition. If V’

2 =V2 and V’1 =V1 both the operational amplifiers act as voltage

follower. If V1 V2 the circuit has differential gain by the formula VO / (V2-V1)=1+(2R/R‘).





CIRCUIT DIAGRAM:

BRIDGE CIRCUIT:

INSTRUMENTATION AMPLIFIER:





DESIGN:Output voltage VO = (1 + ( 2R / R‘)) (V2 -V1)

Differential gain Ad = VO / (V2 - V1)

= 1 + (2R / R‘)Choose R = 10k Ω

For Ad max = 100

100 = 1 + (20k /R‘)

R’ = 20K

---------99

R’ max = 200Ω.

For Ad min = 10

10 = 1 + (20k /R‘)

R’ min = 2.2KΩ.

IL = I1+I2

I1 = (V-(V0 /2)) / R

I2 = (V0-(V0 /2)) / R

IL = (V-(V0 /2) + (V0-(V0 /2)) / R = (V-V0+V0) / R = V/R

IL is independent of RL. If R is constant then IL V

PROCEDURE:

1. The connections are made as per the circuit diagram.

2. The bridge circuit was balanced by varying 100Ω Rheostat.3. The output voltage V1 and V2 of balanced circuit were given as input to the

op-amp A1 and A2.4. Varying the resistance R1 the bridge circuit the voltage V1 and V2 were

varied.5. Varying the R’ the output voltage was measured then the differential gain

was calculated using formula,=20 log (VO /(V2 -V1)).





V to I CONVERTER:

PIN DIAGRAM:





MODEL GRAPH:

TABULAR COLUMN:

Displacementfrom initialplace (cm)

OutputVoltage (volt)

OutputCurrent (mA)

Gain =(VO / (V2 -V1))

Gain =20 log (VO / (V2 -V1)) in dB





RESULT:Thus the physical quantities are converted into electrical quantities and by

using electrical quantities instrumentation amplifier was designed, constructed andoutputs were verified.





CIRCUIT DIAGRAM:

AC VOLTAGE REGULATOR:

DC VOLTAGE REGULATOR:

PIN DETAILS:






Ex.No.2 AC/DC VOLTAGE REGULATOR USING SCR

AIM:

(i)To design, construct and test a AC voltage regulator using SCR.

(ii)To design, construct and test a DC voltage regulator using SCR.

APPARATUS REQUIRED:



1 Transformer 230V/12V 1

2 SCR 2P4M 2

3 Diode BY 127 2

4 Resistor 100 k 12 k

21

5 Bread Board 1

6 Connecting Wires As required

7 CRO 1

8 DRB 1



1 Transformer 230V/24V 1

2 SCR TYN 604 1

3 Diode 1N4001 4

4 Resistor 10 k 2

5 Bread Board 1

6 Connecting Wires As required

7 CRO 1

8 DRB 2

9 IC 7812 1

10 Capacitors 1000µf 1

100µf 1






MODEL GRAPH:







THEORY:

The SCR is switched ON and OFF to regulate the output voltage in AC andDC voltage regulator.


If the SCR is connected to AC supply and load, the power flow can becontrolled by varying the RMS value of AC voltage applied to the load and this typeof power circuit is caused as AC voltage regulator. Applications of AC voltageregulator are in heating on load transformers for changing light controls, speedcontrols and polyphase controls, induction motors and AC magnet controls for powertransfer. Two types of power control are normally used.

(1) ON-OFF control(2) Polyphase Angle control

AC regulators are those converter which converts fixed ac voltage directly tovariable ac voltage of the same frequency. The load voltage is regulated bycontrolling the firing angle of SCRs. AC voltage controllers are thyristor baseddevices.

The most common circuit is the inverse parallel SCR pair in which twoisolated gate signals are applied. Each of the two SCRs are triggered at alternate half cycles of the supply and the load voltage is part of input sine wave. The SCR is anunidirectional device like diode, it allows current flow in only one direction but unlikediode, it has built-in feature to switch ON and OFF. The switching of SCR iscontrolled by gate and biasing condition. This switching property of SCR allows tocontrol the ON periods thus controlling average power delivered to the load.

In this circuit SCR1 is forward biased during positive half cycle and SCR2 isforward biased during negative half cycle. SCR1 is triggered at the firing angle ωt=α

and supply voltage is impressed on the load resistance(RL). It conducts from theremaining positive half cycle, turning OFF when the anode voltage becomes zero atωt=π.

SCR2 is triggered at the firing angle ωt=α+π and conducts till ωt=2π. Hence

the load is alternating in polarity and is part of sine wave. The firing angle of bothSCRs is controlled by gate circuit. The conduction period of SCR is controlled byvarying gate signals within specified values of maximum and minimum gate currents.

For gate triggering, a signal is applied between the gate and cathode of the

device. AC sources are normally used as gate signals. This provides proper isolationbetween power.

DC VOLTAGE REGULATOR:If SCR’s are used to convert an AC voltage into DC voltage then they are

known as DC voltage regulators. Eg. Battery changes for high current capacitybatteries in DC voltage control only phase control is used.

The transformer is used to step down the voltage from 230V to 24V. This isgiven as input to bridge rectifier. The bridge rectifier converts incoming ac signal tounidirectional wave. Therefore we get full wave rectifier output at the output of bridgerectifier. This is given as input to SCR. The gate of SCR is triggered with firing angle

of α. During positive half cycle, diode D1 and D2 conducts and during negative half cycle, diode D3 and D4 conducts. The full wave rectified output is given to capacitive





filter. The output of capacitor is dc that it eliminates ripple contents of bridge rectifieroutput. The dc input is given to regulator IC. The unregulated output must be 2Vgreater than regulated output voltage. The load current may vary from 0 to ratedmaximum output current. The output voltage is regulated dc.

TABULAR COLUMN:


DRB 1 value(KΩ) Amplitude (V) TON(ms)

DRB 2 value(KΩ) Amplitude (V) TOFF(ms)


DRB value(KΩ) Amplitude (V) TON(ms) Resistance RL(KΩ) Output (V)





DESIGN:

AC VOLTAGE REGULATOR USING SCR:

Triggering circuit for SCR:

12 V ac is rectified by diode BY 127. SCR 2P4M is used to trigger.

Let the current be 1mA. R=V/I=12V/1mA=12KΩ.

DC VOLTAGE REGULATOR USING SCR:

Triggering circuit for SCR:

24 V ac is rectified by diode 1N4001. SCR TYN604 is used to trigger.

Let the current be 1mA. R=V/I=12V/1mA=12KΩ.

PROCEDURE:

AC VOLTAGE REGULATOR USING SCR:1. Connections are made as shown in the circuit diagram.

2. The supply is given by means of step down transformer.

3. Anode terminal of SCR1 is connected to the anode terminal of diode, is

connected to cathode of SCR1 by means of resistor as the load.

4. Hence the voltage regulation is verified at load terminal.

DC VOLTAGE REGULATOR USING SCR:

1. Connect the two terminals at the top of bridge rectifier.

2. The positive terminal of the bridge rectifier is connected to one terminal atthe load and at the other terminal to anode terminal of SCR.

3. The pin 15 connected from the power supply to the load.

4. Then the DC voltage regulation is checked and verified.

RESULT:

Thus both AC and DC voltage regulators were designed, constructed and theoutput waveforms were drawn.





CIRCUIT DIAGRAM:





Ex.No.3 SEQUENTIAL TIMER

AIM:

To design sequential timer to switch ON and OFF at least three delays in a

particular sequence using IC 555 timer.

APPARATUS REQUIRED:


1 IC 555 3

2 Bread Board 1

3 Resistors 33k 3

100k 3

220 3

4 RPS 15 Connecting wires As required

6 Capacitors 10f 3

0.01f 6

7 LED 3

THEORY:

Sequential timer is the simplest form of the process control timer in which

many timing operations carried out sequentially one by one. Each timing operation iskept in active condition for a predefined amount of time and then goes to off

condition. Similarly the controller activates all the operations as per the defined

timings.

This type of sequential controller is required for injection moulding machine,

back sealing experiments where it required to activate solenoids, relays other

activating mechanism for a predefined time sequentially one by one.

Sequential timer is used for control process. The timer IC 555 is operated in

monostable mode. The mode monostable multivibrator circuit is useful for generating

single output pulse of adjustable data form in response to a trigger signal. The widthof the output pulse depends only on external component connected to the op-amp. The

output of first multivibrator is given to the trigger input of the second one. Similarly it

is connected in sequential order. The time period of each timer determine the

triggering period of LED.





PIN DIAGRAM:

MODEL GRAPH:

OBSERVATION:

LED 1 ON Time =

LED 2 ON Time =

LED 3 ON Time =





DESIGN:

This relay should be energised for 1 sec.

ON Time TH=1.1*R*C

Here we design for 1 sec.

By choosing the value of R=100k

The value of C approximated to C=10f

Similarly we have

RA=RB=RC=R=100k

CA=CB=CC=C=10f

PROCEDURE:

1. The circuit connections were given as shown in circuit diagram.

2. The triggering is given to pin 2 of timer 1.

3. When the trigger pulse is given the LED glows one by one sequentially.

RESULT:

Thus the circuits for sequential timer was designed, constructed and outputs

were verified.





CIRCUIT DIAGRAM:

FSK MODULATOR:





Ex.No.4 WIRELESS DATA MODEM

AIM:

To design, construct and test wireless data modem using FSK modulator(555)

and FSK demodulator (565).

APPARATUS REQUIRED:

THEORY:

FREQUENCY SHIFT KEYING: A digital-to-analog modulation technique. Data is transmitted by shifting

between two close frequencies with ones represented by one frequency and zeroes bythe other.

Frequency-shift keying (FSK) is a method of transmitting digital signals. Thetwo binary states, logic 0 (low) and 1 (high), are each represented by an analogwaveform. Logic 0 is represented by a wave at a specific frequency, and logic 1 isrepresented by a wave at a different frequency. A modem converts the binary datafrom a computer to FSK for transmission over telephone lines, cables, optical fiber, orwireless media. The modem also converts incoming FSK signals to digital low andhigh states, which the computer can “understand”.

Whenever the message or information signal rides over the carrier it is calledmodulation. In electrical sense the operation of riding over the amplitude of carriermeans to alter the amplitude of carrier. This is called amplitude modulation of thecarrier. Thus the message signal becomes the modulating signal and it is transmittedby variations in the amplitude of the carrier.

The transmission media suffers three major problemsA. AttenuationB. Distortion

C. Noise


1 Transistor BC557 1

2 IC 555 , 565 , 741 Each one

3 Resistors 58K 47K

1K 10K

600

12

152

4 Capacitors 0.01f , 0.1f

0.02f

25

5 AFO & CRO 1

6 RPS & Dual RPS 1

7 Bread board & Connecting wires As required





Due to these inherent problems, it is very difficult to have wide range of

frequency in the signals that are transmitted. Therefore to transmit data over wireless

medium, it is necessary to use a modulator which restore the number of frequency in

the transmitted signal by employing digital modulation techniques like ASK, FSK or

PSK. Also Binary PSK with non-coherent detection can also be employed.A modem is a device that takes the digital electrical pulses from a terminal or

computer and converts them into continuous analog signal that is used for

transmission. The binary FSK technique is employed for modulating the digital

signals. IC 555 timer and transistor acting as switch, when the device acts as

transformer. PLL IC 565 can be used for demodulator. It consists of phase detection

LPF amplifier.

DESIGN:

FSK MODULATOR:

ON time TH=0.693RBC

OFF time TL=0.693(RA+RB)C

Total time T=TH+TL=0.693(RA+2RB)C

1

f 1=-------------------------- (1)

0.69(RA+2RB) C1

1

f 2=------------------------------------ (2)0.69(RA+2RB) C 1C2

-----------

C1+C2

Duty cycle D=ON time/Total time=(RB)/(RA+2RB)=0.3

RB= 0.3RA+0.6RB

RB=0.75RA

Let f 1= 1050 Hz, f 2= 1250 Hz, C1=0.01µf

From (1)

1 1050=---------------------------------

0.69(RA+2*0.75RA) 0.01µf

1

=---------------------------------

0.69*2.5RA*0.01µf

RA=55.2K

RB=0.75RA

RB=41.4K





PIN DIAGRAM:

MODEL GRAPH:





From (2)

1

1250=------------------------------------------------

0.69(55.2K+2(41.4K)) 0.01µf*C2

----------------

0.01µf+C2

0.01µf+C2

C2 =-----------------------------------

0.69(138K)1250*0.01µf

0.01µf+C2

C2 =---------------

1.19

1.19C2 - C2 = 0.01µf

0.19C2 = 0.01µf

C2 = 52.63 nf

FSK DEMODULATOR:

Upper cut off frequency of RC ladder circuit f H=1/(2RC)

Assume R2=R3=R4=R

C2=C3=C4=C

f H=(key in frequency+2 maximum frequency)/2

=(150+2(1250))/2=1325Hz

Let C=0.02µf then R=1/(2Cf H)=1/(2*1325Hz*0.02µf )=7K

f 0=0.3/(R1C1)

f 0=(f 1+f 2)/2=(1050+1250)/2=1150Hz

Let C1=0.01µf

R1=0.3/(1150*0.01µf)=26K

f lock =8f 0 /10=(8*1150)/10=920Hz

f capture should be less than f lock .

Choose f capture =400Hz

f capture =(1/2)(2*f lock )/(R0C0)

R0=internal resistance=3.6K

C0=(2f lock )/(42f capture

2R0)=920/(2(400)2*3.6K)=254nf





OBSERVATION:

INPUT:

Amplitude = V

ON time TH = ms

OFF time TL= ms

Frequency f = Hz

FSK MODULATOR:

For positive half cycle

Amplitude = V

ON time TH = ms

OFF time TL= ms

Frequency f = Hz

For negative half cycle

Amplitude = V

ON time TH = ms

OFF time TL= ms

Frequency f = Hz

FSK DEMODULATOR:

Amplitude = V

ON time TH = ms

OFF time TL= msFrequency f = Hz





PROCEDURE:

FSK MODULATOR:

1. Connections are given as per the circuit diagram.

2. The digital input was applied at the input of FSK modulator.

3. The square wave output was noted in astable mode by CRO.

FSK DEMODULATOR:

1. Connections are given as per the circuit diagram.

2. The FSK modulated output is given as a input in the demodulation

circuit.

3. The output of the demodulator gives a modulating signal by using

voltage comparator was noted.

RESULT:Thus the circuit for wireless data modem using FSK modulator (555) and

demodulator (NE 656) were designed, constructed and outputs were verified.





CIRCUIT DIAGRAM:

PIN DIAGRAM:





Ex.No.5 PCB LAYOUT DESIGN USING CAD

AIM:

To design Component/Board layout, PCB layout of the given circuit

using AutoCAD 2000.

PROCEDURE:

1. Double click on AutoCAD 2000 or ACAD.

2. Ensure that you select metric (i.e. you are telling AutoCAD that you will be

drawing in metres and millimetres NOT feet and inches) in the dialog box.

3. AutoCAD will now create a new drawing file named drawing1.dwg.

4. Select various electronic components from FileOpenAutoCAD

folderSample folderDesign Center folderAnalog IntegratedCircuits& Basic Electronics& CMOS Integrated Circuits.

5. Thus Component/Board layout is drawn by various AutoCAD commands.

6. Then PCB layout is drawn by various AutoCAD commands.

COMPONENT/BOARD LAYOUT:

PCB LAYOUT:

RESULT:

Thus the Component/Board layout, PCB layout of the given circuit using

AutoCAD 2000 was designed.





APPENDIX

AUTOCAD COMMANDS

“CAD is a abbreviation of Computer Aided Design and the term “Auto” indicates the

company Name AutoDesk Inc., U.S., developed the Package AutoCAD.Starting AutoCAD:

First, your computer should have Windows XP or Win 2000 Operating System.When

u switch ON your computer, the Operating System is automatically loaded. Youcan

start AutoCad by double clicking on AutoCAD icon on desktop of a computer.

DONUT:

Draws filled circles and rings.

Command: Donut or Do

Specify inside diameter of donut<10.0000>:Enter your value

Specify outside diameter of donut<20.0000>:Enter your valueSpecify center of donut or <exit>:Click any point as center point

VIEWRES:

Sets the resolutions for objects in current view port.

Command:viewers

Do u want fast zooms[yes/no]<Y>: Press enter(fast zooms is no longer a functioning

option of this command and remains for script compatibility only)

Enter circle zoom present(1 – 20000 )<current>: Enter an integer from 1 – 20000 or

press Enter The model is regenerated.

VIEWRES controls the appearance of circles, arcs, ellipses and splines using short

vectors. The greater the no of vectors the smoother the appearance of circle or arc.

For eg if u create a very small circle and then zoom in it might to appear to be

polygon. Using VIEWRES to increase the zoom percentage and regenerate the

drawing updates and smoothes the circle appearance. Decreasing the zoom percentage

has the opposite effect.

Before VIEWRES After VIEWRES

VIEWRES at 15 VIEWRES at 500

AutoCAD is a popular program because it can be customized to suit an

individual's needs. The toolbars are a good example of this. You can have the toolbars

you use most often on the screen all the time. You can easily make them go away sothat you have more drawing space. You can also customize them so you have the





most common commands on one toolbar. For example, the dimensioning toolbar is

one that you will not want taking up space on your screen while drawing, but is very

handy when you're dimensioning your drawing.

Opening AutoCAD

Open up AutoCAD, you should be greeted with a screen asking if you want to open

an existing drawing or start from scratch. (Dependant on your version of AutoCAD,

the screen will be slightly different - The image shown below is for AutoCAD 2002).

Select 'Create Drawings', then 'Start from Scratch'. Ensure that you select metric (i.eyou are telling AutoCAD that you will be drawing in metres and millimetres NOT

feet and inches).

AutoCAD will now create a new drawing file named drawing1.dwg.

AutoCAD will default to 'model space'. For now it is sufficient to say that model

space is the blank space where all the drawing is carried out. Paperspace (now called

Layout space since AutoCAD 2000) isn't really required until we are ready to plot

(print) the drawing.

Toolbars

There are many toolbars available in AutoCAD. Go to View > Toolbars from the drop

down menu to see them all. For now make sure that the following toolbars are

checked:

Draw - Contains AutoCADs most common drawing tools

Modify - Contains all of the common editing commands such as erase, copy etc.

Object Properties - Contains 'layer' information as well as object colours and line style

options. (Covered Later).

Standard Toolbar - Contains open & save options as well as zoom & pan options.





Object Snap - AutoCAD's intelligent drawing aid - joins lines at specific points.

(Covered later).

Arrange the icons to where is comfortable for you (A typical layout is shown below):

The Command LineThe command line appears at the bottom of the AutoCAD screen (as shown above)

and displays the commands entered. Commands can be entered into the command line

in text format, or by using the icons or drop down menus. 'Old School' Cad users tend

to type each command into the command line, as was required with older versions of

AutoCAD. It is much quicker to familiarise yourself with the tool bars and drop down

menus. There are times however when commands need to be typed into the command

line, these will be covered later.

Drawing Technique - AutoCAD's Co-ordinate systemJust before we start drawing, one more important point. AutoCAD works on a

co-ordinate system. When drawing, we can be very precise and specify an exact point

in space where a line should begin or end. The 2D co-ordinates system is based on the

horizontal and vertical axis named x and y. (This is shown in the bottom left of the

AutoCAD drawing area, the X Y icon is called the UCS).





Title Bar - This will show you what program you are running and what the current

filename is.

Pull-down menus - These are the standard pull-down menus through which

you can access almost all commands.

Main toolbar - This has most of the standard Windows icons, as well as the

most common AutoCAD commands.

Property toolbar - This toolbar gives a way to quickly modify an object's

properties, such as layer and linetype.

Floating toolbar - This is a toolbar that can be moved around the screen, or

'docked' as the main toolbar is.

Drawing space - This is where you draw. You have an almost infinite area to

draw and this is just a 'section' of the entire space.

Scrollbars - These work like in other windows programs. You can also use the

PAN command to move around your drawing. WCS Icon - This is here to show you which direction positive X and positive

Y go. The W means you're in the World Co-ordinate System. (It can be

changed to a User Co-ordinate System.)

Status Bar Tray Icons - These icons give you updates on items like reference

files program updates and print status.

Command line - When you type a command, you will see it here. AutoCAD

uses this space to 'prompt' you for information. It will give you a lot of

information and tell you where you are in the command. Watch this line while

learning. Status bar - This allows to see and change different modes of drawing such as

Ortho, Osnaps, Grid, Otrack, etc.

Tool Palette - Collection of tools in one area that can be organized into

common catagories.

Command Keystroke Icon Menu Result

Properties PROPERTIESModify >

Properties

Displays the

properties of

the object in theProperties

Palette





Command Description Options

COPY

or

CP

Draws a copy of selected objects using two methods -

- "base point" method, or "displacement" method.

M Allows multiple copies

to be made of an object

BASE Specifies origin of current drawing for subsequent

insertion into another drawing -- is normally set to

point 0,0,0

can be transparent

DONUT

or

DOUGHNUT

Draws filled rings with specified inside and outside

diameters

ERASE or E Erases selected entities from the drawing

EXPLODE Separates a block, dimension or hatch pattern into its constituent entities or makes a

polyline into a series of straight lines. In the case of a block that is exploded, if it

was originally drawn on the 0 layer, it returns to that layer, regardless of the layer it

was inserted on, and it loses its referential connection to the original block. In the

case of a dimension or hatch pattern that has been exploded, their parts go back to

the 0 layer, and are assigned the logical color (BYBLOCK) regardless of the layer

they were drawn on. In the case of an exploded polyline, it loses any width it mayhave had.

LINE or L Draws straight lines <RET> In reply to From Point: prompt, line begins at

end of previous line or arc

C In reply to To point: prompt, closes the polygon

back to first "From Point"

U In reply to To point: prompt, undoes last line

segment

MOVE or M Moves designated entities to another location

NEW Creates a new drawing. When selected from a menu or typed in at the

Command: prompt, this command brings up a dialogue box which allows setting

a name for the new drawing by typing the name in the box, selection of a

"prototype" drawing or typing a name of the new drawing and then an = sign

and then the name of a drawing to be used as a prototype.

OFFSET Creates a new line, polyline arc or circle parallel to the <number> specifies





entity and at a specified distance from it. offset distance

T "Through" allows

specification of a point

through which theoffset line, polyline,

arc or circle is to pass

OPEN Opens an existing drawing

ORTHO Constrains drawing so that only lines aligned with the

grid can be drawn -- usually means only horizontal or

vertical lines, however, if the crosshairs are rotated

through the "Snap" "Rotate" command sequence, the

lines drawn are constrained to being parallel with the

crosshair rotation. Constraint can be overridden by

snapping to a point or by entering exact coordinates for

endpoints.

can be transparent

OSNAP Enables points to be precisely located on reference

points of existing objects. This is the so-called

"Running Mode" of OSNAP, which sets selection

method to run continuously until set to NON (none) or

until overridden by selecting another "Interrupt Mode"OSNAP method from the cursor menu. Combinations

of OSNAP methods can be used by selecting a series of

options separated by commas. For instance, if you want

ot always pick either endpoints or intersection points

when locating endpoints of lines, you would issue the

command as follows:

OSNAP <RET> END,INT <RET>

can be transparent

CEN CENter of arc or

circle

END closest

ENDpoint of arc orline

INS INSertion point of

Text or Block

INT INTersection of

line, arc, or circle

MID MIDpoint of

line, arc, rectangle

side, or polygon side

NEA NEArest pointselected by aperture on

line, polyline, arc, or

circle

NOD NODe (another

name for a Point)

NON NONe -- used

when a "Running

OSNAP" is on to

temporarily turn off





OSNAP selection

PER PERpendicular

point to line, arc or

circle -- when used

with an arc or circle itwill draw a line to the

surface of the arc or

circle heading toward

the center point

QUA QUAdrant point

of arc or circle (top,

bottom, right or left

side)

QUI QUIck mode --this is a modifier to

one of the other

OSNAP options -- it

will find the first point

that meets the

requirements, not

necessarily the closest

point to the aperture.

TAN TANgent point

to arc or circle

QSAVE Saves the current drawing "Quickly" without requesting a filename (as long as file

has already been given a name)

QUIT Exits AutoCAD -- if the current drawing has not been Saveds in its current state, a

dialogue box will appear asking if you want to Save the drawing, Discard the

changes, or Cancel the Exit command

SNAP Specified a round-off interval for point entry sothat entities can be placed at precise locations

can be transparent<number> sets snap alignment

resolution

ON aligns designated points

OFF does not align designatged

points

A sets aspect ratio (differing X

and Y spacing)





R Rotates the snap grid and

crosshairs, and turns on SNAP

after, if not already turned on

S Selects either Standard

(rectangular) or Isometric Snap

grid

TEXT Draws text characters of any size with selected

styles

J Prompts for justification

options

S Lists or selects text style

A Aligns text between two

points, with style-specified

width factor, AutoCAD

computes approximate height

proportional to length of text

line

C Centers text horizontally

about a defined point

F Fits text between two points,

with specified height,

AutoCAD computes

approximate width factor to fillthe distance between the two

points

M Centers text horizontally and

vertically about a defined point

R Right-justifies text

BL Bottom Left justification

BC Bottom Center justification

BR Bottom Right justification

ML Middle Left justificationMC Middle Center justification

MR Middle Right justification

TL Top Left justification

TC Top Center justification

TR Top Right justification

VIEWRES Allows you to control the precision and speed of circle and arc drawing on the

monitor by specifying the number of sides in a circle. Acts like an AutoCAD

variable. Recommend that it be set to 2000.





ZOOM Enlarges or reduces the display

magnification of the drawing, without

changing the actual size of the entities

can be transparent

<number> multiplier from original

magnification

<number X> multiplier fromcurrent magnification

<number XP>multiplier of

magnification relative to paper

space -- used for plotting to get

right plot scale in each viewport

A ("All") fills limits of drawing to

screen

C ("Center") makes picked point

the center of the screen

D ("Dynamic") makes an adjustible

rectangular lens appear on the

screen which is capable of being

made smaller or larger and moved

to different positions over the

drawing and once set by the user,the drawing will quickly zoom to

the location and magnification set

for the lens. This sub-command is

no longer useful because all

computers have very fast zooms

naturally now.

E ("Extents") makes the farthest

edges of the actual visible drawing

fill up the graphics screen

L ("Lower-Left") makes the point

picked become shoved to the lower-

left corner of the graphics screen

P ("Previous") zooms back to

whatever the last zoom, previous to

the current zoom was -- AutoCAD

stores about 10 of these, so you can





walk backward in zoom

magnification 10 times

V ("Virtual Screen") makes the

largest area available to thegraphics card fill the graphics

screen -- this varies with the

quantity of graphics RAM that your

graphics card has

W ("Window") asks you to pick the

lower left corner and the upper right

corner of a zoom window and then

fits that window to the graphics

screen





Ex.No.6 MICROCONTROLLER BASED SYSTEMS DESIGN

AIM:

To design microcontroller based system for simple applications like security

systems combination lock etc. using 89c series flash micro controller.

APPARATUS REQUIRED:

1. PC with windows operating system, RIDE IDE software, WINISP

software

2. 8051 microcontroller

3. RS 232C Serial Cable

4. Home Security System

PROCEDURE:

1. Use RS 232C Serial Cable to connect 8051 microcontroller through serial

port.

2. Set the DIP switch as follows

DIP switch1: RS 232

DIP switch2: PGM for Programming Flash mode, EXE for execution

Mode DIP switch3: INT

3. Write the ALP program (text document) in notepad, save as ASM

language (ASM format) in Micro 51.4. Set the DIP switch2 in PGM for Programming Flash.

5. Run WINISP.

6. Set the parameter for the following fields in WINISP window

A CHIP: P89C51RD2

B PORT: Select Serial port connected to RS 232C Serial Cable

C OSC: 12MHz

7. If flash is not blanked, perform erase operation.

8. Load hexa file containing the object code to be programmed into flash

from Micro 51 by clicking load file.9. Program the flash by clicking program part.

10. Set the DIP switch2 in EXE for execution mode.

11. Enter the password in Home Security System.

12. If a valid password is given, door will open.

RESULT:

Thus microcontroller based system for simple applications like security

systems combination lock etc. using 89c series flash micro controller was

designed and executed.





PROGRAM:

$include(reg51xa.inc)org 0000h;

IOCONT equ 0ffc0h ;DCONT equ 0ffc4h ;address assign for lcd data lineCONTR1 equ 0ff0fh ;Control register of the 8255_1.Port1A equ 0ff0ch ;Port APort1B equ 0ff0dh ;Port BPort1C equ 0ff0eh ;Port CContr equ 0ff13h ;Control register of the 8255_2.PortA equ 0ff10h ;Port A.PortB equ 0ff11h ;Port B.PortC equ 0ff12h ;Port C.

call Bussy_check ;call lcd_IOCONT ;mov A,#38h ;mov dptr,#DCONT ;movx @dptr,A ; 5*7 matrix lcd init.

call Bussy_check ;call lcd_IOCONT ;mov A,#80h ;mov dptr,#DCONT ;movx @dptr,A ; starting location .

call Bussy_check ;call lcd_IOCONT ;mov A,#04h ;mov dptr,#DCONT ;movx @dptr,A ; Set cursor move direction.

call Bussy_check ;call lcd_IOCONT ;

mov A,#0Eh ;mov dptr,#DCONT ;movx @dptr,A ; enable display,cursor ,cursor blining

call Bussy_check ;call lcd_IOCONT ;mov A,#01 ;mov dptr,#DCONT ;movx @dptr,A ; clear display.





mov dptr,#MYDATA ;mov r7,#80h ;1st line data displaymov r3,#16 ; r3 load display characters lengthlcall display ;call display routine

mov dptr,#MYDATA1 ;mov r7,#0c0h ;2nd line data displaymov r3,#16 ; r3 load display characters lengthlcall display ; call display routinecall delay ;call delay ; call delay routinemov r4,#3 ;this value initialise for no time wrong password access

jump_start:call Bussy_check ;call lcd_IOCONT ;mov A,#01 ;

mov dptr,#DCONT ;movx @dptr,A ; clear display.mov dptr,#MYDATA2 ;mov r7,#80h ;1st line data displaymov r3,#9 ; r3 load display characters lengthlcall display ;

;~~~~~~;4*4 matrix key read;8255_1 Assign Port A and Port C are output port and port B is input portkey_start:mov dptr,#CONTR1 ;Dptr load Control register address.mov A,#83h ;Acc load 83hex.movx @dptr,A ;Dptr point to Acc .mov r2,#06 ;no of character use in password.mov dptr,#4000h ;dptr contain address of 4000h.;this address locationcontiniously contain password character.back_keystart:mov r0,dpl ;dpl contain lower byte of dptr.mov r1,dph ;dph contain higher byte of dptr.dec r2 ;decrement r2 value.mov a,r2 ;Acc load r2.

jnz getdata ;Acc!=0 load another char.ljmp end1 ;If Acc==0 goto password compare.getdata:mov A,#00 ;Acc load 0.mov dptr,#Port1A ;PortA init.movx @dptr,A ;Port1A load 0.continue:mov dptr,#Port1B ;key Read continiously checkingmovx A,@dptr ;Acc load dptr point to the value.anl A,#0fh ;logical operation of Acc and 0f.cjne A,#0fh,key_Next ;if Acc!=0x0f read charsjmp continue ;if Acc==0x0f key continiously checking

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;ROW 1 ;;;;;;;;;;;;;;;;;;;;;;;;;





key_Next:mov a,#0eh ;Acc load 0x0e.0x0e is 4th row of key pad.mov dptr,#Port1A ;dptr load port1A address.movx @dptr,A ;dptr point to Acc.Port1A load Acc value.mov dptr,#Port1B ;dptr contain Port1B address.movx A,@dptr ;Acc load dptr point to the value.

anl A,#0fh ;AND operation for Acc and 0x0f.cjne A,#0fh,ctrow1 ;compare Acc and 0x0fhsjmp row1 ;Acc==0x0f go to row1.if Acc!=0x0f go to ctrow1.ctrow1:cjne A,#0eh,Next30 ;compare to colomn wise key.mov A,#30h ;Acc load

0x30.0x30 ASCII char is '0';ljmp key_end ;Next30:cjne A,#0dh,Next31 ;mov A,#31h ;Acc load 0x31.0x31 ASCII char is '1';ljmp key_end ;Next31:cjne A,#0bh,Next32 ;

mov A,#32h ;Acc load 0x32.0x32 ASCII char is '2';ljmp key_end ;Next32:cjne A,#07h,row1 ;mov A,#33h ;Acc load 0x33.0x33 ASCII char is '3';

ljmp key_end ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ROW 2 ;;;;;;;;;;;;;;;;;;;;;;;;;

row1 :mov a,#0dh ;Acc load 0x0d.0x0d is 3rd row of key pad.mov dptr,#Port1A ;movx @dptr,A ;mov dptr,#Port1B ;movx A,@dptr ;anl A,#0fh ;cjne A,#0fh,ctrow2 ;sjmp row2 ;ctrow2:cjne A,#0eh,Next34 ;mov A,#34h ;Acc load

0x34.0x34 ASCII char is '4';sjmp key_end ;

Next34:cjne A,#0dh,Next35 ;mov A,#35h ;Acc load 0x35.0x35 ASCII char is '5';sjmp key_end ;Next35:cjne A,#0bh,Next36 ;mov A,#36h ;Acc load 0x36.0x36 ASCII char is '6';sjmp key_end ;Next36:cjne A,#07h,row2 ;mov A,#37h ;Acc load 0x37.0x37 ASCII char is '7';sjmp key_end ;





;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ROW 3 ;;;;;;;;;;;;;;;;;;;;;;;;;

row2:mov a,#0bh ;Acc load 0x0b.0x0b is 2nd row of key pad.mov dptr,#Port1A ;

movx @dptr,A ;mov dptr,#Port1B ;movx A,@dptr ;anl A,#0fh ;cjne A,#0fh,ctrow3 ;sjmp row3 ;ctrow3:cjne A,#0eh,Next38 ;mov A,#38h ;Acc load

0x38.0x38 ASCII char is '8';sjmp key_end ;Next38:cjne A,#0dh,Next39 ;

mov A,#39h ;Acc load 0x39.0x39 ASCII char is '9';sjmp key_end ;Next39:cjne A,#0bh,Next41 ;mov A,#41h ;Acc load 0x41.0x41 ASCII char is 'A';sjmp key_end ;Next41:cjne A,#07h,row3 ;mov A,#42h ;Acc load 0x42.0x42 ASCII char is 'B';sjmp key_end ;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ROW 4 ;;;;;;;;;;;;;;;;;;;;;;;;;

row3:mov a,#07h ;Acc load 0x07.0x07 is 1st row of key pad.mov dptr,#Port1A ;movx @dptr,A ;mov dptr,#Port1B ;movx A,@dptr ;anl A,#0fh ;cjne A,#0fh,ctrow4 ;sjmp key_end ;ctrow4:cjne A,#0eh,Next43 ;

mov A,#43h ;Acc load0x43.0x43 ASCII char is 'C';sjmp key_end ;Next43:cjne A,#0dh,Next44 ;mov A,#44h ;Acc load 0x44.0x44 ASCII char is 'D';sjmp key_end ;Next44:cjne A,#0bh,Next45 ;mov A,#45h ;Acc load 0x45.0x45 ASCII char is 'E';sjmp key_end ;Next45:cjne A,#07h,key_end ;mov A,#46h ;Acc load 0x46.0x46 ASCII char is 'F';

sjmp key_end ;key_end : mov r7,A ;





call display2 ;display key read char.mov dpl,r0 ;mov dph,r1 ;mov A,r7 ;movx @dptr,A ;get char Store to Dptr .Dptr Base address 4000h.

inc dptr ;Vary dptr.each char contion cotinious memory 4000hto4004h.lcall delay ;delay routine.

jump:ljmp back_keystart ;if get another char goto back_key start.END1:lcall compare ;two string compare routine.; compare Enter passwordroutine compare :mov r2,#5 ;r2 load count of char .mov dptr,#Password ;dptr contain base address of the Password.mov r3,#00 ;r3 load 0x00.equal:mov r0,dpl ;r0 contain lower byte of dptr.mov r1,dph ;r1 load higher byte of dptr.mov a,#00 ; Acc load 0x00;

movc a,@a+dptr ;Acc contain code segment data.mov B,A ;B reg. load Acc.mov dptr,#4000h ;dptr contain address 4000h.inc r3 ;mov a,r3 ;sjmp jump2 ;incr: inc dptr ;

jump2:djnz r3,incr ;mov r3,A ;mov A,#00 ;movx a,@dptr ;cjne A,B,NOT_equal ;compare Acc value And B reg.value.mov dpl,r0 ;mov dph,r1 ;inc dptr ;djnz r2,equal ;lcall step_motor ;Call step_motor routine .mov r4,#3 ;ljmp jump_start ;NOT_equal:djnz r4,busser_0ff ;mov A,#82h ;

mov dptr,#CONTR1 ;movx @dptr,A ;mov A,#01 ;mov dptr,#Port1C ;minimum 3 times Put wrong password.after buffer is ON.movx @dptr,A ;lcall access_stop ;display Access denied.and system not access it when afterreset.sjmp Re_start ;busser_0ff:call Bussy_check ;call lcd_IOCONT ;mov A,#01 ;

mov dptr,#DCONT ;movx @dptr,A ; clear display.





mov dptr,#MYDATA4 ;mov r7,#80h ;1st line data displaymov r3,#16 ; r3 load display characters lengthlcall display ;mov dptr,#MYDATA5 ;

mov r7,#0c0h ;2nd line data displaymov r3,#16 ; r3 load display characters lengthlcall display ;lcall delay ;lcall delay ;ljmp jump_start ;Re_start:sjmp Re_start ;

;Access denied subroutineaccess_stop : call Bussy_check ;call lcd_IOCONT ;

mov A,#01 ;mov dptr,#DCONT ;movx @dptr,A ; clear display.mov dptr,#MYDATA6 ;mov r7,#80h ;1st line data displaymov r3,#16 ; r3 load display characters lengthlcall display ;ret ;

;Stepper motor routine;stepper motor rotate clockwise and anticlockwise direction;control register set 0x80 all Ports are output port.step_motor :mov A,#80h ;mov dptr,#Contr ;Control register address assign Dptr.movx @dptr,A ;all ports are output port.;Stepper motor rotate forward directionmov r3,#0 ;back5:mov dptr,#Port1C ;movx A,@dptr ;

jz forward_end ;mov dptr,#stepper ;mov r1,dpl ;mov r2,dph ;mov r0,#04h ;call rotate ;call rotate subroutine.inc r3 ;mov a,r3 ;cjne a,#13,back5 ;forward_end:call delay ;;Stepper motor rotate reverse direction

back_6:mov dptr,#reverse ;mov r1,dpl ;





mov r0,#04h ;call rotate ;call rotate subroutine.djnz r3,back_6 ;ret ;

;door delay routinedelay1 : mov r7,#01h ;back3:mov r6,#0A1h ;back1:mov r5,#0ffh ;next:djnz r5,next ;djnz r6,back1 ;djnz r7,back3 ;ret ;

;Steper motor rotate clockwise and anti clockwise direction.

rotate : back_:mov a,#0h ;movc A,@A+dptr ;mov dptr,#PortA ;movx @dptr,A ;call delay1 ;inc r1 ;mov dpl,r1 ;mov dph,r2 ;djnz r0,back_ ;ret ;

;Bussy_check subroutineBussy_check :mov A,#02 ;mov dptr,#IOCONT ;movx @dptr,A ;mov dptr,#DCONT ;back:movx A,@dptr ;anl A,#80h ;cjne A,#00,back ;

mov A,#00 ;mov dptr,#IOCONT ;movx @dptr,A ;

ret ;

;lcd enable rotinelcd_IOCONT :mov A,#00 ;mov dptr,#IOCONT ;movx @dptr,A ;ret;





;lcd display subroutinedisplay :back4:mov A,r7 ;mov r0,dpl ;mov r1,dph ;

call bussy_check ;call lcd_IOCONT ;mov dptr,#DCONT ;mov A,r7 ;movx @dptr,A ;mov dpl,r0 ;mov dph,r1 ;mov a,#0h ;movc A,@A+dptr ;mov r6,A ;call bussy_check ;

mov A,#01 ;mov dptr,#IOCONT ;movx @dptr,A ;mov A,r6 ;mov dptr,#DCONT ;movx @dptr,A ;mov dpl,r0 ;mov dph,r1 ;inc r7 ;inc dptr ;djnz r3,back4 ;ret ;

display2 :call bussy_check ;mov A,#01 ;mov dptr,#IOCONT ;movx @dptr,A ;mov A,#2ah ;mov dptr,#DCONT ;movx @dptr,A ;ret ;

;delay routinedelay: mov r7,#003h ;back_3:mov r6,#0ffh ;back_1:mov r5,#0ffh ;next_:djnz r5,next_ ;djnz r6,back_1 ;djnz r7,back_3 ;ret ;





MYDATA :db " Vi Security " ;MYDATA1 :db " System ";MYDATA2 :db "Password: ";MYDATA3 :db 0eh,0dh,0bh,07h ;

Password :db "00000";reverse :db 0ah,06h,05h,09h ; ANTI CLOCKWISE DIRECTIONstepper :db 09h,05h,06h,0ah ; CLOCKWISE DIRECTIONMYDATA4 :db " checkyour ";MYDATA5 :db " Pass word ";MYDATA6 :db " Access Denied " ;end;





CIRCUIT DIAGRAM:

AMPLITUDE MODULATION:





Ex. No.7 DESIGN OF AM MODULATION AND DEMODULATIONDate:

AIM:To design AM signal using multiplier IC for the given carrier frequency and

modulation index and demodulate

APPARATUS REQUIRED:


1 IC MC1496 1

2 Bread Board 1

3 Resistors 51 k

k k

3,5,1,1

4k

k k

2,2,1,1,1

4 RPS 1

5 Connecting wires As required

6 Capacitors 10f 1

0.001f,0.1f,0.0

1f

1,2,1

7 FG 2

8 Diode IN 4001 1

PROCEDURE:

Connections are made as per the circuit diagram

Give the modulating signal to pin no 10 through the FG.

Give the carrier signal to pin no 10 through the capacitor of 0.1f usinganother FG.

Note down the AM signal at pin no 6.

Choose the amplitude level of converter keeping frequency at constant depthof modulation was calculated.

Give AM signal to pin no 1 of demodulator circuit.

Note down the demodulator signal at pin no 2 of IC 1496.





CIRCUIT DIAGRAM:AMPLITUDE DEMODULATOR:

MODEL GRAPH:

TABULATION:

THEORY:





Modulation: It is the process in which the characteristics of high

frequency carrier wave is varied in accordance with instantaneous value of

other wave.

Amplitude Modulation: The amplitude of carrier wave is varied in accordancewith the instantaneous values of message signal is called amplitude

modulation.The bandwidth of the AM is twice the bandwidth of the base band

signal. The amplitude modulation wave also produces two sidebands(Upper

and Lower).

The extent of amplitude variation in AM about unmodulated carrier amplitude

is measured in terms of a factor called modulation index defined as the ratio

of modulating signal amplitude to carrier amplitude. This factor also known

as depth of modulation, degree of modulation and modulation factor(ma).

If ma<1 then the modulation is called under modulation, ma>1 then the

modulation is called over modulation, ma=1 then the modulation is called

critical modulation.

AM Demodulation: It is the process of extracting the message signal by using

a same carrier that was used for modulation from the modulated signal.

The most commonly used AM detector is simple diode detector. The

signal at the secondary is half wave rectified by diode D. This diode is thedetector diode the resistance R is the load resistance to rectifier and C is the

filter capacitor. In the positive half cycle of the AM signal diode conducts and

current flows through R, where as in negative half cycle, the diode is

reverse biased and no current flows. Therefore only positive half of the AM

signal appears across R. Capacitor reconstructs the original modulating signal

and high frequency carrier is removed.

Result:Thus the AM modulation and demodulation circuits were constructedand modulation index was calculated.

CIRCUIT DIAGARM:





FREQUENCY MODULATION:





Ex. No.7 DESIGN OF FM MODULATION AND DEMODULATIONDate:

AIM:To design FM signal using IC 566 for the given carrier frequency and

demodulat the FM using PLLNE 565.

APPARATUS REQUIRED:

S.No

Name of the Apparatus Range Quantity

1 IC 566 1

2 Bread Board 1

3 Resistors 39 k k k

1,1,1

4 RPS 1

5 Connecting wires As required6 Capacitors 0.01f, 0.001f 1,2

7 FG 1

THEORY:

Modulation:

It is the process in which the characteristics of high frequency carrier

wave are varied in accordance with instantaneous value of other wave.

Frequency Modulation:

Frequency modulation is the process of varying the frequency of a

carrier wave in proportion to the instantaneous amplitude of the modulating signal

without any variation in the amplitude of the carrier wave. Because the amplitude of

the wave remains unchanged, the power associated with an FM wave is constant.

When the modulating signal is zero, the output frequency equals f c

(centre frequency).When the modulating signal reaches its positive peak, the

frequency of the modulated signal is maximum and equals(f c + f m). At negative peaks

of the modulating signal, the frequency of the FM wave becomes minimum and equal

to (f c - f m).Thus, the process of frequency modulation makes the frequency of

the FM wave to deviate from its centre frequency(f c).By an amount ( + or - Δf) where

Δf is termed as the frequency deviation of the system. During this process, the total

power in the wave does not change but a part of the carrier power is transferred to the

side bands. There are two types of FM they are

1.Narrow band FM

2.Wide band FM

Frequency demodulation

It is a process which is used to receive the origin of signals.





MODEL GRAPH:

TABULATION:





PROCEDURE:

Connections are made as per the circuit diagram

Give the modulating signal to pin no 5 through the FG.

Note down the corresponding amplitude and time period of the FM modulatedsignal.

Apply the modulated signal as input to the PLL.

RESULT:

Thus the frequency modulation and its demodulation circuits were designedand waveforms are plotted.





CIRCUIT DIAGRAM:

TRUTH TABLE:





Ex. No.8 PSUEDO RANDOM SEQUENCE GENERATORDate:

AIM:

To generate the pseudo random sequence using linear feedback shiftregister and verify the output using truth table.

APPARATUS REQUIRED:1.DFF(IC 7484)2.XOR (IC 7486)3.Digital Trainer kit4.connecting wires

PROCEDURE:

Connections are made as per the circuit diagram. Logic inputs are given as per the circuit diagram.

Observe the output and verify the the truth table.

RESULT:

Thus the pseudo random sequence was generated using linear feedback shift

register and the output was verified using truth table.





ALU PROGRAM:





Ex. No.9 DESIGN OF ARITEMETIC LOGIC UNITDate:

AIM:

To write HDL program for designing arithmetic logic unit andsimulate it using xilinx ISE9.2i.

SOFTWARE USED:

XILINX ISE 9.2i

PROCEDURE:

i) Open project navigator.

ii) Go to the file and click the new projectiii) Type the project name as “synthesis”iv) The “property wizard” is open to check all properties such as

product, categories, family, device etc. then click nextv) Create new source wizard appears then click nextvi) Project summary is displayed then click nextvii) Go to the project and click “new source”viii) Then type the full name “half adder” as well as select verilog

module then click nextix) “Define module window” here we assign the input and output of

half adder, clicks next and click finishx) Type the program and save itxi) Make sure that the source is in “BEHAVIOUR”xii) Then click the ISE simulator and view the signal windowxiii) Force the input data corresponding circuitxiv) Simulate the program using ISE simulator

RESULT:

Thus the HDL program was written for arithmetic logic unit and

simulated using xilinx.





Ex. No.10 DESIGN A DSP BASED SYSTEM FOR ECHO CANCELLATIONDate:

AIM:

To write A Matlab program for echo cancellation.

SOFTWARE USED:

Matlab

PROGRAM:clc; clear all; close all;format shortT=input('enter the symbol interval T');

br=input('enter the bit rate value br');rf=input('enter the roll off factor rf');n=[-10 10];y=5000*rcosfir(rf,n,br,T);ds=[5 2 5 2 5 2 5 2 5 5 5 5 2 2 2 5 5 5 5];m=length(ds);n1=length(y);i=1;z=conv(ds(i),y);while (i)

z1=[z,zeros(1,1.75*br)];z=conv(ds(i+1),y);z2=[zeros(1,i*1.7*br),z];z=z1+z2;i=i+1;

end%plot(z);

h=randn(1,length(ds));rs1=filter(h,1,z);for i=1;length(ds),

rs(i)=rs1(i)/15;

endfor i=1:round(x3/3),rs(i)=randn(1);

endfs=[5 5 2 2 2 2 2 5 2 2 2 5 5 5 2 5 2 5 2];m=length(ds);n1=length(y);i=1;z=conv(fs(i),y);while(i)

z1=[z,zeros(1,1.75*br)];

z=conv(fs(i+1),y);z2=[zeros(1,i*1.75*br),z];





z=z1+z2;i=i+1;

endfs1=rs+fs;ar=xcorr(ds,ds);

crd=xcorr(rs,ds);l1=length(ar);

j=1;for i=round(11/2):11,

ar1(j)=ar(i); j=j+1;

endr=toeplitz(ar1);l2=length(crd);

j=1;for i=round(12/2):12,

crd1(j)=crd(i); j=j+1;

endp=crd1;lam=max(eig(r));la=min(eig(r));l=lam/la;w=inv(r)*p;e=rs-filter(w,1,ds);s=1;mu=1.5/lam;ni=1;while(sle -10)

w1=w-2*mu*(e.*ds);rsy4=filter(w1,1,ds);e=y4-rs;s=0;e1=xcorr(e);for i=1:length(e1),

s=s/length(e1);if(y4==rs)

break endni=ni+1;w=w1;

endfigure(1);subplot(2,2,1);plot(z);title('near end signal');subplot(2,2,2);plot(rs);

title('echo produced in the hybrid');subplot(2,2,3);




plot(fs);title('desired signal');subplot(2,2,4);plot(fs1);

title(' echo added with desired signal');figure(2);subplot(2,1,1);plot(y4);title('estimated echo signal using LMS algorithm');subplot(2,1,2);plot(fs1-y4);title('echo cancelled signal');

EC76-Electronics System Design Lab

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Transcript of EC76-Electronics System Design Lab