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EMT 212 EMT 212 ANALOG ELECTRONICS ANALOG ELECTRONICS Professor Robert T Professor Robert T Kennedy Kennedy

EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

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Page 1: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

EMT 212 EMT 212 ANALOG ELECTRONICSANALOG ELECTRONICS

Professor Robert T KennedyProfessor Robert T Kennedy

Page 2: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

Prof. R T Kennedy

Page 3: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIER

Prof. R T Kennedy

SERIES SERIES

F B tr

T FAtco

Vi

Vf

Vd VO

io

-

io

SYSTEM

FEEDBACK

vi

vd

vf

Atco

tr

Page 4: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE TRANSCONDUCTANCE AMPLIFIERAMPLIFIER

Prof. R T Kennedy

+

R1

-

vi io

io

+-

R1

vovi

vdvf

vf

io

ioio

io

Page 5: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIER+

R1

-

vi io

io

Prof. R T Kennedy

vi

+-

R1

vdvf

vf

io

io

io

io

io

Page 6: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS

CLOSED LOOP GAINCLOSED LOOP GAIN

Prof. R T Kennedy

cltctrtc

tc

i

o

otritco

fitco

AA

A

v

i

ivAi

vvAi

,0

0

0

0

)1(

)(

)(

trcltc

tc

A

A

1

,

0

otrf

fid

dtco

iv

vvv

vAi

0

io

SYSTEM

FEEDBACK

vi

vd

vf

Atco

tr

-

Page 7: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS

CLOSED LOOP GAINCLOSED LOOP GAIN

Prof. R T Kennedy

tr

vf R1

io

io

cltctr

o

ftr

AR

Rtr

i

v

,1

1

11

Page 8: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS

CLOSED LOOP INPUT IMPEDANCECLOSED LOOP INPUT IMPEDANCE

Prof. R T Kennedy

in

iIN

in

din

i

vRloopclosedamplifier

i

vrloopopenamplifier

+-

R1

vi

vd

vf

RINrin

iin

iin

ioio

io

Page 9: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS

CLOSED LOOP INPUT IMPEDANCECLOSED LOOP INPUT IMPEDANCE

Prof. R T Kennedy

)(,

0

0

1

1

idealcltc

tcinIN

trtcinINR

ind

otrinIN

in

d

otrinIN

ini

f

in

d

in

fdIN

in

iIN

A

ArR

Ar

rv

irR

r

vi

rR

v

i

v

i

vvR

i

vR

+-

R1

vi

vd

vf

RINrin

iin

iin

ioio

io

Page 10: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS

OUTPUT IMPEDANCEOUTPUT IMPEDANCE

Prof. R T Kennedy

vf v(+)

v(-)

vo

rout

Atc0vd

rou

t

+

-

iou

t

outout i

vrloopopenamplifier 0

Page 11: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS

CLOSED LOOP OUTPUT IMPEDANCECLOSED LOOP OUTPUT IMPEDANCE

+-

R1

vi

vd

vf

ROUTrout

ioio

io

Prof. R T Kennedy

Page 12: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERIDEAL OP-AMP ANALYSISIDEAL OP-AMP ANALYSIS

CLOSED LOOP OUTPUT IMPEDANCECLOSED LOOP OUTPUT IMPEDANCE

Prof. R T Kennedy

OUTtrtcouto

o

otrtcout

oo

ftcout

oo

dtcout

oo

RAri

v

iAr

vi

vAr

vi

vAr

vi

)1(

)(

)(

0

0

0

0

+-

R1

vi

vd

vf

ROUTrout

ioio

io

Page 13: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

AMPLIFIER ‘PRACTICAL’ OP-AMPAMPLIFIER ‘PRACTICAL’ OP-AMP

Prof. R T Kennedy

gnd

+

R1

RF

-

vo

vi

+V

-V

CD

gnd

CD

gnd

RV

RC

Page 14: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

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(-)

Page 15: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

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

+

R1

-

Vo

v(+)=v(-)

ib(+)

ib(-)

iR1

if

RmRCib(+)RC

vR1

1

1

1)()(

1)()(

1)()()(

)(

1)()(

1)(

0

RR

RRR

R

RRRRiiv

R

RRRiRiv

RR

RiiRiv

RiRiv

R

Riii

iii

m

mC

mCCmbbo

mCCbmbo

mC

bbCbo

mfCbo

Cbbf

Rbf

Page 16: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

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

Page 17: EMT 212 ANALOG ELECTRONICS Professor Robert 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

R

VI

R

VI

iiII

DCm

m

outbRm

0)(

)(

R

RV mout 1

)1( 0 trtcinIN

o

ftr

ArR

i

v

Page 18: EMT 212 ANALOG ELECTRONICS Professor Robert 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

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

Page 19: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERHIGH INPUT IMPEDANCE AC VOLTMETERHIGH INPUT IMPEDANCE AC VOLTMETER

Prof. R T Kennedy

R

V

R

VI

R

V

R

VI

III

rmsacpkacavm

rmsacpkacavm

rmsmpkmavm

)()()(

)()()(

)()()(

9.0637.0

222

222

+

-

Vac

Im

~

-

Vout

Rm

R

A+

D1

D3 D4

D2

Page 20: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

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

1V1V 10 k10 k

I

VR

rmsac )(9.0

I

VR DC

Page 21: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERZENER DIODE TESTERZENER DIODE TESTER

Prof. R T Kennedy

+

-

R + -Vout

VDC

ib(-)

VDC

IR

VZ

IZ

DCoutZ

DCZRZout

RZ

DCR

DCR

VVV

VVVVV

IIi

R

V

R

vI

VvVv

0)(

)(

)()(

Page 22: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERZENER DIODE TESTERZENER DIODE TESTER

Prof. R T Kennedy

+

-

R + -Vout

Vin

ib(-)

VDC

IR

VZ

IZ

RZ

breakdownzenerat

VVclampedisV

saturationnegativeV

VuntilhighR

R

RV

DCZout

out

BDZ

Zout

@

1

Page 23: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

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

vVI

vv

0

0

)(

)(

)()(

Page 24: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

TRANSCONDUCTANCE AMPLIFIERTRANSCONDUCTANCE AMPLIFIERLED TESTERLED TESTER

Prof. R T Kennedy

+

-

R + -Vout

Vin

ib(-)

VDC

IR

VD

ID

Page 25: EMT 212 ANALOG ELECTRONICS Professor Robert T Kennedy

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

Page 26: EMT 212 ANALOG ELECTRONICS Professor Robert 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)(

Page 27: EMT 212 ANALOG ELECTRONICS Professor Robert 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

IF

IIN

V(-)

2

2

DCoutL

DCLout

DC

L

LL

VVV

VVV

R

V

R

VI