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EMT 212 EMT 212 ANALOG ELECTRONICSANALOG ELECTRONICS
Professor Robert T KennedyProfessor Robert T Kennedy
Prof. R T Kennedy
TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIER
Prof. R T Kennedy
SERIES SERIES
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Vi
Vf
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io
-
io
SYSTEM
FEEDBACK
vi
vd
vf
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TRANSCONDUCTANCE TRANSCONDUCTANCE AMPLIFIERAMPLIFIER
Prof. R T Kennedy
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R1
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io
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R1
vovi
vdvf
vf
io
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIER+
R1
-
vi io
io
Prof. R T Kennedy
vi
+-
R1
vdvf
vf
io
io
io
io
io
TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS
CLOSED LOOP GAINCLOSED LOOP GAIN
Prof. R T Kennedy
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS
CLOSED LOOP GAINCLOSED LOOP GAIN
Prof. R T Kennedy
tr
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS
CLOSED LOOP INPUT IMPEDANCECLOSED LOOP INPUT IMPEDANCE
Prof. R T Kennedy
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vRloopclosedamplifier
i
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS
CLOSED LOOP INPUT IMPEDANCECLOSED LOOP INPUT IMPEDANCE
Prof. R T Kennedy
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS
OUTPUT IMPEDANCEOUTPUT IMPEDANCE
Prof. R T Kennedy
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS
CLOSED LOOP OUTPUT IMPEDANCECLOSED LOOP OUTPUT IMPEDANCE
+-
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vi
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vf
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Prof. R T Kennedy
TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS
CLOSED LOOP OUTPUT IMPEDANCECLOSED LOOP OUTPUT IMPEDANCE
Prof. R T Kennedy
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vi
vd
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io
AMPLIFIER ‘PRACTICAL’ OP-AMPAMPLIFIER ‘PRACTICAL’ OP-AMP
Prof. R T Kennedy
gnd
+
R1
RF
-
vo
vi
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-V
CD
gnd
CD
gnd
RV
RC
TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIER ‘PRACTICAL’ OP-AMP ‘PRACTICAL’ OP-AMP
OUTPUT DC OFFSET VOLTAGE due to BIAS OUTPUT DC OFFSET VOLTAGE due to BIAS CURRENTSCURRENTS
Prof. R T Kennedy
+
R1
Rm
-
Vi=0
v(-)=0
Vo=ib(-)Rm
v(+)=0
ib(+)
ib(-)
i=0
v(-)=0 ib(-)
TRANSCONDUCTANCE AMPLIFIER TRANSCONDUCTANCE AMPLIFIER ‘PRACTICAL’ OP-AMP‘PRACTICAL’ OP-AMP
OUTPUT DC OFFSET VOLTAGE due to BIAS OUTPUT DC OFFSET VOLTAGE due to BIAS CURRENTSCURRENTS
COMPENSATIONCOMPENSATION
Prof. R T Kennedy
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R1
-
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERAPPLICATIONSAPPLICATIONS
HIGH INPUT IMPEDANCE HIGH INPUT IMPEDANCE VOLTAGE –CURRENT CONVERTERVOLTAGE –CURRENT CONVERTER
HIGH INPUT IMPEDANCE DC VOLTMETERHIGH INPUT IMPEDANCE DC VOLTMETER
HIGH INPUT IMPEDANCE AC VOLTMETERHIGH INPUT IMPEDANCE AC VOLTMETER
ZENER DIODE TESTERZENER DIODE TESTER
DIODE TESTERDIODE TESTER
LED TESTERLED TESTER
Prof. R T Kennedy
TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERHIGH INPUT IMPEDANCE DC VOLTMETERHIGH INPUT IMPEDANCE DC VOLTMETER
Prof. R T Kennedy
+
-
Im
R
A+-
Vout
Rm
VDC
ib(-)
VDC
IR
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VI
R
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERHIGH INPUT IMPEDANCE DC VOLTMETERHIGH INPUT IMPEDANCE DC VOLTMETER
Prof. R T Kennedy
+
-
Im
R
A+-
Vout
Rm
VDC
ib(-)
VDC
IR
AMMETER SCALING
IIFSDFSD VVDCDC
1 1 mAmA
1V1V 1 k1 k
1 1 mAmA
5V5V 10 10 kk
I
VR DC
IIFSDFSD VVDCDC
50 50 AA
1V1V 20 k20 k
50 50 AA
5V5V 100 100 kk
I
VR DC
TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERHIGH INPUT IMPEDANCE AC VOLTMETERHIGH INPUT IMPEDANCE AC VOLTMETER
Prof. R T Kennedy
R
V
R
VI
R
V
R
VI
III
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-
Vac
Im
~
-
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R
A+
D1
D3 D4
D2
TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERHIGH INPUT IMPEDANCE AC VOLTMETERHIGH INPUT IMPEDANCE AC VOLTMETER
I
VR
rmsac )(9.0
Prof. R T Kennedy
AMMETER SCALINGIIFSDFSD VacVac
(rms)(rms)
100 100 AA 1V1V 9 k9 k
+
-
Vac
Im
~
-
Vout
Rm
R
A+
D1
D3 D4
D2
IIFSDFSD VVDCDC
100 100 AA
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I
VR
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VR DC
TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERZENER DIODE TESTERZENER DIODE TESTER
Prof. R T Kennedy
+
-
R + -Vout
VDC
ib(-)
VDC
IR
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IZ
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RZ
DCR
DCR
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERZENER DIODE TESTERZENER DIODE TESTER
Prof. R T Kennedy
+
-
R + -Vout
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IR
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERDIODE TESTERDIODE TESTER
Prof. R T Kennedy
+
-R
+ -
Vout
ib(-)
VDC
VD
IDIR
ID
V(-)
Dout
DCD
DCDCR
VV
R
VI
i
R
V
R
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vv
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TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERLED TESTERLED TESTER
Prof. R T Kennedy
+
-
R + -Vout
Vin
ib(-)
VDC
IR
VD
ID
TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERTEST CURRENT > OP-AMP OUTPUT TEST CURRENT > OP-AMP OUTPUT
LIMITLIMIT
+
-
R + -Vout
Vin
ib(-)
VDC
IR
VD
ID
-Vsuppply
Prof. R T Kennedy
TRANSCONDUCTANCE TRANSCONDUCTANCE AMPLIFIERAMPLIFIER
GROUNDED LOAD GROUNDED LOAD current controlled by (+) inputcurrent controlled by (+) input
Prof. R T Kennedy
+
-
RL VoutVL
ib(+)
VDC
IL
R R
R
R
VL
VL
IFIIN
R
VI
R
VVVI
R
VV
R
VVI
III
vV
vv
v
DCL
LoutDCL
LoutLDCL
FINL
outVL
outV
outV
2
2)(
2)()(
2)(
TRANSCONDUCTANCE TRANSCONDUCTANCE AMPLIFIERAMPLIFIER
GROUNDED LOAD GROUNDED LOAD current controlled by (-) inputcurrent controlled by (-) input
Prof. R T Kennedy
+
-
RL VoutVL
ib(+)
VDC
IL
R R
R R
IF
IIN
V(-)
2
2
DCoutL
DCLout
DC
L
LL
VVV
VVV
R
V
R
VI