Post on 11-Jan-2016
description
RANGAKAIAN DIODA
Hamzah Afandi, Antonius Irianto danBetty Savitri
Sources: Millman, Jacob, Grabel, Arvin, Microelectronics,
Mc. Graw Hill Int. Ed., 1994.Robert Boylestad, Louis Nashelsky Sixth Edition; Prentice Hall,1997
Review: p-n Junction
Volt-Ampere Characteristic of Diode
A 1 TD VVSD II
= type of semiconductor factor ( for Si = 2, Ge = 1 )VT = Volt-Equivalent of Temperature = 25 mV (at 293 oK)
VD
ID
ISVZ
V (0.6 - 0.7 for Si) (0.2 - 0.3 for Ge)
Review: p-n Junction
Load-line Concept
VD
ID
IDQ
VDQ
VAAR
VAA
Quiscent Point
VD
+
_
ID+
_VAA
R
1
0.
T
DV
V
SDDAA
D
DDAA
eIIR
VVI
VIRV
Analysis of Diode Circuit:
Ideal Diode Approach
VD
ID
VD
+ _
ID
Forward/ActiveReverse
AA
KK
AA
KK
AA
KK
AA
KK
AA
KK
Simple diode circuit analysis
Diode Circuit:
+5V
1K
+9V
10K
-9V
1K
-5V
10K
(a) (b) (c) (d)
Simple diode circuit analysis
Diode Circuit:
+10V
2K
2K
4K
6K
R1
R2
R3
R4
D
Q: V12 = ….. ? (D = ON/OFF ?)
V1 V2
VKK
K
RR
RV 610
64
610
43
42
VKK
K
RR
RV 510
22
210
21
21
01652112 VVVV
Diode is CORRECTLY OFF!
Assumption that Diode is OFF
A LOGIC GATE
Diode Circuit:
+5V
RS
RL
D1
VI VO+6V0V
VI VO
+6V +5V 0V 0V
VA
VB
+6V
+6V
A LOGIC GATE
Diode Circuit:
+5V
RS
RL
D1
VO
VB VO
+6V +6V +5V
D2
VA
0V +6V 0V+6V 0V 0V
0V 0V 0V
Clipping CircuitDiode Circuit:
+
10V
R1
D20V
Vi
20V
Vo
10V
Clipping CircuitDiode Circuit:
+
10V
R1
D20V
Vi
20V
Vo
-10V
Clipping CircuitDiode Circuit:
+
10V
R1
D1
20V
Vi
10V
D2 20V
Vo
10V
-10V
Diodes as Rectifiers (Half Wave Rect.)
Diode Circuit:
RL
D
Vo
VmVm
dVmVDC 0
0
cos2
sin 2
1
Diodes as Rectifiers (Full Wave Rect.)
Diode Circuit:
RL
D1
Vo
D2
VmVm
dVmVDC
2cos
2
2sin
2
12 0
0
Diodes as Rectifiers (Full Wave Rect.)
Diode Circuit:
Vo
D1 D2
D3 D4
RL
Vm
VDC
2
Diodes as Rectifiers (Full Wave Rect. + Filter)
Diode Circuit:
Vo
D1 D2
D3 D4
RL C VmVDC
Diodes as Rectifiers (Voltage Regulator Concept)
Diode Circuit:
100)(
%% DC
r
V
rmsVfactorrippler
100Re %%
FL
FLNL
V
VVgulationVoltageVR
Vr = Ripple Voltage (RMS),VDC = DC Output Voltage
VNL = DC Voltage at no-loadVFL = DC Voltage at full-load
Peak DetectorsDiode Circuit:
R
D
C
Vi
VO
AM DemodulatorDiode Circuit:
R
D
C
Vi
Vo
Voltage DoublerDiode Circuit:
D2C1
D1 C2
+VSP
Vi VO = 2 VSP
2VSP
+_
+_
Switching FlybackDiode Circuit:
+Vs
i = 0
+
_
v
+Vs
i+
_
v
+Vs
C
+_
VSW
t
VC
t
SW SW SW
D
LLL
Flyback PreventionDiode Circuit:
+Vs
+
_
i
+Vs
+
_i
SWSW
DL
DL
Analysis of Diode Circuits:
Large-Signal Model (Piecewise Linear Approach)
VD
ID
ISVZ
V
1/Rf
ID=(VD-V )/RF
1/Rr
ID=(VD/RR) - IS
Analysis of Diode Circuits:
Large-Signal Model (Piecewise Linear)
Rf
Forward-Biased Diode (On)
Reversed-Biased Diode (Off)
V
RrIS
ID=(VD-V )/RF ID=(VD/RR) - IS
A
KK
A
K
A
K
A
K
Analysis of Diode Circuits:
Characteristic Transfer Curve Method
+
10V
R1
D20V
Vi
20V
Vo
10V
vi
vo
1/Rr
1/Rf
Analysis of Diode Circuits:Using PWL & Characteristic Transfer Curve
Solve For:
+
5V
5K
D1
D2
5V
vO
5K
t
vi
10
-10
CALCULATIONEXAMPLES
Given in class