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![Page 1: 3441 Industrial Instruments 1 Chapter 2 Analog Signal Conditioning Dr. Bassam Kahhaleh Princess Sumaya Univ. Electronic Engineering Dept.](https://reader037.fdocuments.us/reader037/viewer/2022103022/56649ceb5503460f949b75fb/html5/thumbnails/1.jpg)
34413441Industrial Instruments 1Industrial Instruments 1
Chapter 2Chapter 2
Analog Signal ConditioningAnalog Signal Conditioning
Dr. Bassam KahhalehDr. Bassam Kahhaleh
Princess Sumaya Univ.Princess Sumaya Univ.Electronic Engineering Dept.Electronic Engineering Dept.
![Page 2: 3441 Industrial Instruments 1 Chapter 2 Analog Signal Conditioning Dr. Bassam Kahhaleh Princess Sumaya Univ. Electronic Engineering Dept.](https://reader037.fdocuments.us/reader037/viewer/2022103022/56649ceb5503460f949b75fb/html5/thumbnails/2.jpg)
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Analog Signal ConditioningAnalog Signal Conditioning
ObjectiveObjective
Introduce the basic technique of signal Introduce the basic technique of signal conditioning in process control.conditioning in process control.
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Analog Signal ConditioningAnalog Signal Conditioning
DefinitionDefinition
Signal conditioning refers to operations Signal conditioning refers to operations performed on signals to convert them to a performed on signals to convert them to a form suitable for interface with other form suitable for interface with other elements in the process-control loop.elements in the process-control loop.
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Analog Signal ConditioningAnalog Signal Conditioning
Principles of Analog Signal ConditioningPrinciples of Analog Signal Conditioning Signal-Level and Bias ChangesSignal-Level and Bias Changes LinearizationLinearization ConversionsConversions
Current Signal (4 – 20 mA)Current Signal (4 – 20 mA) Digital InterfaceDigital Interface
Filtering & ImpedanceFiltering & ImpedanceMatchingMatching
LoadingLoadingVx
Rx
Vy R L
Sensor x
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits Divider CircuitsDivider Circuits
Loading effect of RLoading effect of RLL
RRLL >> R >> R22
R 1
R 2 R L
V S
V D
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits Divider CircuitsDivider Circuits
Self-heating (RSelf-heating (R22 is a temperature sensor) is a temperature sensor)
ExampleExampleVS = 5 V
R1 = 10 K Ω
4 KΩ ≤ R2 ≤ 12 KΩ
1.43 V ≤ VD ≤ 2.73 V
0.51 mW ≤ PD ≤ 0.62 mW
R 1
R 2
V S
V D
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits Bridge CircuitsBridge Circuits
Wheatstone BridgeWheatstone Bridge
R 1 R 2
R 3
V D
R 4
VRR
RV
RR
RV
42
4
31
3
3241 RRRR
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits Bridge CircuitsBridge Circuits
Wheatstone BridgeWheatstone BridgeGalvanometer DetectorGalvanometer Detector
R 1 R 2
R 3
V D
R 4
VTh
R Th
a b
a
b
R G
Galvanometer
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits Bridge CircuitsBridge Circuits
Wheatstone BridgeWheatstone BridgeBridge Resolution (Ideal & Non ideal Detector)Bridge Resolution (Ideal & Non ideal Detector)
R 1 R 2
R 3
V D
R 4
VTh
R Th
a b
a
b
R G
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits Bridge CircuitsBridge Circuits
Wheatstone BridgeWheatstone BridgeLead CompensationLead Compensation
R 1 R 2
R 3
V D
R 4
a b
c
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits Bridge CircuitsBridge Circuits
Wheatstone BridgeWheatstone BridgeCurrent Balance BridgeCurrent Balance Bridge
R 1 R 2
R 3
V D
R 4
ab
R 5I
R4 >> R5
(R2+R4) >> R5
5542
54
31
3 )(RIV
RRR
RRV
RR
RV
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits Bridge CircuitsBridge Circuits
Wheatstone BridgeWheatstone BridgePotential Measurement Using BridgesPotential Measurement Using Bridges
R 1 R 2
R 3
V D
R 4
ab
Vc = Vx + Va
042
4
31
3
V
RR
RV
RR
RVx
cV x
0)(
5542
54
31
3
RIVRRR
RRV
RR
RVx
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits Bridge CircuitsBridge Circuits
AC BridgesAC Bridges
Z 1Z 2
Z 3
V D
Z 4
3241 ZZZZ
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits RCRC Filters Filters
Low-pass Low-pass RCRC Filters Filters
)2/(1 CRfc
R
C V outV in
2
1
1
c
in
out
ffV
V
ω
Gain
ω0
1
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits RCRC Filters Filters
Low-pass Low-pass RCRC Filters Filters
Cascaded StagesCascaded Stages
R 1
C 1 V outV in
ω
Gain
ω0
1
C 2
R 2
)2/(1 CRfc
2
1
1
c
in
out
ffV
V
Loading Effect R2 >> R1, C2 << C1
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Analog Signal ConditioningAnalog Signal Conditioning
Example 2.11Example 2.11
A measured signal has a frequency < 1 KHz, A measured signal has a frequency < 1 KHz, but there is unwanted noise at about 1 MHz. but there is unwanted noise at about 1 MHz. Design a low-pass filter that attenuates the Design a low-pass filter that attenuates the noise to 1%. What is the effect on the noise to 1%. What is the effect on the measurement signal at it max. of 1 KHz?measurement signal at it max. of 1 KHz?
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Analog Signal ConditioningAnalog Signal Conditioning
Example 2.11Example 2.11Vout / Vin = 0.01 at 1 MHzVout / Vin = 0.01 at 1 MHz
ffcc = 10 KHz = 10 KHz
Use C = 0.47 Use C = 0.47 μμFF R = 33.9 R = 33.9 ΩΩ (too small -> too much current)(too small -> too much current)
Use C = 0.01 Use C = 0.01 μμFF R = 1591 R = 1591 ΩΩStandard R = 1.5 KStandard R = 1.5 KΩΩ
ffcc = 10610 Hz = 10610 Hz Vout / Vin = 0.0099995Vout / Vin = 0.0099995
At 1 KHz:At 1 KHz: Vout / Vin = 0.996Vout / Vin = 0.996
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits RCRC Filters Filters
High-pass High-pass RCRC Filters Filters
)2/(1 CRfc R
C
V outV in
2
1
c
c
in
out
ff
ff
V
V
ω
Gain
ω0
1
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Analog Signal ConditioningAnalog Signal Conditioning
Passive CircuitsPassive Circuits RCRC Filters Filters
Band-pass Band-pass RCRC Filters Filters
R H
C H
V out
R L
C LV in
ω
Gain
ω2
1
ω1
If ω1 << ω2 Then you use the individual equations for the LPF and HPF
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Inverting AmplifierInverting Amplifier
V out
R 1
V in
−
+
R 2
1
2
R
R
V
V
in
out
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Non Inverting AmplifierNon Inverting Amplifier
V out
R 1
V in
+
−
R 2
1
21
R
RR
V
V
in
out
V out = V in
V in+
−
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Summing AmplifierSumming Amplifier
V out
R 2
V 1
−
+
R 1
2
2
31
1
3V
R
RV
R
RVout
R 3
V 2
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Differential AmplifierDifferential Amplifier
V out
R 2
V 2
−
+
R 1
)( 211
2VV
R
RVout
R 2
V 1
R 1
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Differential Instrumentation AmplifierDifferential Instrumentation Amplifier
V out
R 3
V 2
−
+
R 2
)(2
1 211
21VV
R
R
R
RV
Gout
R 3
V 1
R 2
−
+
+
−R 1
R 1
R G
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Voltage-to-Current ConverterVoltage-to-Current Converter
I L
R 3
−
+
R 1
inL VRR
RI
31
2
R 2
V in
R 4
R 5
R L
42531 )( RRRRR
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Current-to-Voltage ConverterCurrent-to-Voltage Converter
I−
+
R
R
V outIRVout
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers IntegratorIntegrator
V out
R
V in
−
+
C dtV
RCV inout
1
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers DifferentiatorDifferentiator
V out
R
V in
−
+
C
dt
dVRCV
inout
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Power SupplyPower Supply
V out
V in−
+
V CC
V CC
t0
+V CC
−V CC
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Power SupplyPower Supply
V out
V in−
+V CC
t
+V CC
0
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Power SupplyPower Supply
V out
V CC
t
+V CC
0
V in
−
+
½ V CC
½ V CC
+
−
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Analog Signal ConditioningAnalog Signal Conditioning
Operational AmplifiersOperational Amplifiers Power SupplyPower Supply
V out
V CC
t
+V CC
0
V in
−
+
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End of Chapter 2End of Chapter 2
Analog Signal ConditioningAnalog Signal Conditioning