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Dr. Vincent Chang (張文清) Lecture Active-Load Differential Amplifiers Vincent Chang Copyright © by Knowledge Master, Inc.

X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

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Page 1: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

LectureActive-Load Differential Amplifiers

Vincent Chang

Copyright © by Knowledge Master, Inc.

Page 2: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Vincent Chang

BJT

• Analysis‐by‐inspection

•Norton equivalent

CMOS

• BJT vs. CMOS•Norton equivalent

• Gain

Output resistance

•Question• Derivation

Dr. Vincent Chang (張文清)

Outline

Page 3: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Active-Load D-Amp

Page 4: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Active-Load Differential Amplifier

Differential pair

Page 5: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Active-Load Differential Amplifier

Differential pair

Current mirror

Page 6: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Analysis-by-Inspection

Page 7: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Analysis-by-Inspection (Take Note)

1

Page 8: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Analysis-by-Inspection

2

Page 9: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Analysis-by-Inspection

3

Page 10: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Analysis-by-Inspection

3

Current mirror

Page 11: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Analysis-by-InspectionCurrent mirror

43

Page 12: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Analysis-by-Inspection

5

Page 13: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Equivalent Circuit

5

Page 14: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Finesse—Norton Equivalent Circuit

5

Page 15: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Finesse—Norton Equivalent Circuit

55

Page 16: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Finesse—Norton Equivalent Circuit

Page 17: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Open-Circuit Voltage Gain

outmd

od Rg

vvA

Page 18: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Differential Gain

)( 42 oomoutmd

od rrgRg

vvA

T

Aom

d

od V

VrgvvA

21

21

ooo rrr 42

Page 19: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Vincent Chang

BJT

• Analysis‐by‐inspection

•Norton equivalent

CMOS

• BJT vs. CMOS•Norton equivalent

• Gain

Output resistance

•Question• Derivation

Dr. Vincent Chang (張文清)

Outline

Page 20: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

BJT Differential Amplifier

Page 21: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

BJT Differential Amplifier

Differential pair

Current mirror

Page 22: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

BJT vs. CMOS D-Amp

Differential pair

Current mirror

Differential pair

Page 23: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

BJT vs. CMOS Differential Amplifier

Differential pair

Current mirror

Differential pair

Current mirror

Page 24: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

CMOS Differential Amplifier

Page 25: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Gain

omoutmd

od rgRg

vvA

21

Page 26: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Vincent Chang

BJT

• Analysis‐by‐inspection

•Norton equivalent

CMOS

• BJT vs. CMOS•Norton equivalent

• Gain

Output resistance

•Question• Derivation

Dr. Vincent Chang (張文清)

Outline

Page 27: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

)( 42 oomoutmd

od rrgRg

vvA

Page 28: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

Page 29: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

Page 30: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

Page 31: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

Page 32: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

Page 33: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

Page 34: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

Page 35: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

Page 36: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

Page 37: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

222

1222

1222

2)1(

)||()1(

ooo

eomo

eoo

rrrrrgrrrrR

Page 38: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

222

1222

1222

2)1(

)||()1(

ooo

eomo

eoo

rrrrrgrrrrR

Page 39: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

222

1222

1222

2)1(

)||()1(

ooo

eomo

eoo

rrrrrgrrrrR

Page 40: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

222

1222

1222

2)1(

)||()1(

ooo

eomo

eoo

rrrrrgrrrrR

Page 41: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

Page 42: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

Page 43: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

Page 44: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

Current mirror

Page 45: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

Current mirror

Page 46: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

4o

t

rv

Page 47: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

4o

t

rv

Page 48: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

)11(

222

42

4242

42221

oot

o

t

o

t

o

t

o

t

o

t

o

t

o

tttt

rrv

rv

rv

rv

Rv

rv

Rv

Rviii

21

o

tt R

vi

4o

t

rv

Page 49: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

)11(

222

42

4242

42221

oot

o

t

o

t

o

t

o

t

o

t

o

t

o

tttt

rrv

rv

rv

rv

Rv

rv

Rv

Rviii

21

o

tt R

vi

4o

t

rv

Page 50: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

4o

t

rv

)11(

222

42

4242

42221

oot

o

t

o

t

o

t

o

t

o

t

o

t

o

tttt

rrv

rv

rv

rv

Rv

rv

Rv

Rviii

Page 51: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

4o

t

rv

)11(

222

42

4242

42221

oot

o

t

o

t

o

t

o

t

o

t

o

t

o

tttt

rrv

rv

rv

rv

Rv

rv

Rv

Rviii

1

42

1 )11()/( oo

ttout rrviR

Page 52: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

21

o

tt R

vi

4o

t

rv

42 || ooout rrR

1

42

1 )11()/( oo

ttout rrviR

Page 53: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

Output Resistance

222

1222

1222

2)1(

)||()1(

ooo

eomo

eoo

rrrrrgrrrrR

Page 54: X489-9 Active-Load Differential Amplifiers - UC Berkeley Extucberkeleyext.com/documents/IC/X489/9_Active-Load Differential... · BJT Differential Amplifier Differential pair ... PowerPoint

Dr. Vincent Chang (張文清)

WARNING

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