1 intro to bjt current mirrors - uc berkeley extucberkeleyext.com/documents/ic/x489/1_intro to bjt...
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Dr. Vincent Chang (張文清)
Lecture Intro to BJT Current Mirror
Vincent Chang
Copyright © by Knowledge Master, Inc.
Vincent Chang
Intro
• Current gain•Output resistance
Base current compensation
• Concept• Current transfer ratio
Multiple outputs
• npn mirror• pnp mirror• Emitter area
Dr. Vincent Chang (張文清)
Outline
Dr. Vincent Chang (張文清)
Review: Discrete-Circuit
EC
2CC
1CC
EC
2CC
1CC
Bias with single supply Bias with two supplies
Dr. Vincent Chang (張文清)
Review: Discrete-Circuit Bias
EC
2CC
1CC
EC
2CC
1CC
Bias with single supply Bias with two supplies
Dr. Vincent Chang (張文清)
IC Bias
Dr. Vincent Chang (張文清)
Current Mirror/Current Source
Dr. Vincent Chang (張文清)
Current Mirror/Current Source
Dr. Vincent Chang (張文清)
Current Mirror/Current Source
Differential amplifier
Dr. Vincent Chang (張文清)
Mode of Operation
Differential amplifier
Dr. Vincent Chang (張文清)
Review
Common-emitter I-V
Dr. Vincent Chang (張文清)
Forward-Active
F-active
Differential amplifier
Dr. Vincent Chang (張文清)
Finite Current Gain
BEV
F-active
Dr. Vincent Chang (張文清)
Finite Current Gain
BEV
TBE VVSC eII
F-active
Dr. Vincent Chang (張文清)
Finite Current Gain
TBE VVSC eII
F-active
BEV
Dr. Vincent Chang (張文清)
Finite Current Gain
TBE VVSC eII
F-active
BEV
Dr. Vincent Chang (張文清)
Finite Current Gain
TBE VVSC eII
Dr. Vincent Chang (張文清)
Finite Current Gain
TBE VVSC eII
Dr. Vincent Chang (張文清)
Finite Current Gain
TBE VVSC eII
212 O
CCREF IIII
Dr. Vincent Chang (張文清)
Finite Current Gain
TBE VVSC eII
212 O
CCREF IIII
Dr. Vincent Chang (張文清)
Finite Current Gain
21
12
REF
O
II
212 O
CCREF IIII
Dr. Vincent Chang (張文清)
Finite Early Voltage
Dr. Vincent Chang (張文清)
Finite Early Voltage
Dr. Vincent Chang (張文清)
Finite Early Voltage
A
CEVVSCREF V
VeIII TBE 11
Dr. Vincent Chang (張文清)
Finite Early Voltage
A
BEVVSCREF V
VeIII TBE 11
BEV
Dr. Vincent Chang (張文清)
Finite Early Voltage
A
BEVVSCREF V
VeIII TBE 11
A
OVVSCO V
VeIII TBE 12
Dr. Vincent Chang (張文清)
Finite Output Resistance
A
BEVVSCREF V
VeIII TBE 11
A
OVVSCO V
VeIII TBE 12
Dr. Vincent Chang (張文清)
Finite Output Resistance
Dr. Vincent Chang (張文清)
Venice Beach, Los Angeles
Dr. Vincent Chang (張文清)
Finite Output Resistance
2
1slopeoO
O
rVI
Dr. Vincent Chang (張文清)
Finite Output Resistance
2oO
Oout r
IV
R
2
1slopeoO
O
rVI
Vincent Chang
Intro
• Current gain•Output resistance
Base current compensation
• Concept• Current transfer ratio
Multiple outputs
• npn mirror• pnp mirror• Emitter area
Dr. Vincent Chang (張文清)
Outline
Dr. Vincent Chang (張文清)
Key Concept
Dr. Vincent Chang (張文清)
Key Concept
Base current compensation
Dr. Vincent Chang (張文清)
Base Current Compensation
Base current compensationBasic current mirror
Dr. Vincent Chang (張文清)
Base Current Compensation
RVVVI BEBECC
REF31
Base current compensation
Dr. Vincent Chang (張文清)
Current Transfer Ratio
Dr. Vincent Chang (張文清)
Current Transfer Ratio
Dr. Vincent Chang (張文清)
Current Transfer Ratio
Dr. Vincent Chang (張文清)
Current Transfer Ratio
Dr. Vincent Chang (張文清)
Current Transfer Ratio
21
1
REF
O
II
Dr. Vincent Chang (張文清)
Current Transfer Ratio
21
1
REF
O
II
2
21
1
REF
O
II
Dr. Vincent Chang (張文清)
Current Transfer Ratio
21
1
REF
O
II
2
21
1
REF
O
II
Dr. Vincent Chang (張文清)
Current Transfer Ratio
2
21
1
REF
O
II
)1(2
C
CREF
III
Dr. Vincent Chang (張文清)
Current Transfer Ratio
2
21
1
REF
O
II
)1(2
C
CREF
III
)(21
1
REF
O
II
Dr. Vincent Chang (張文清)
Current Transfer Ratio
)1(2
C
CREF
III
)(21
1
REF
O
II
2
21
1
REF
O
II
Vincent Chang
Intro
• Current gain•Output resistance
Base current compensation
• Concept• Current transfer ratio
Multiple outputs
• npn mirror• pnp mirror• Emitter area
Dr. Vincent Chang (張文清)
Outline
Dr. Vincent Chang (張文清)
Multiple Outputs
Dr. Vincent Chang (張文清)
Multiple Outputs
Dr. Vincent Chang (張文清)
Multiple Outputs
Dr. Vincent Chang (張文清)
Multiple Outputs
PNP Current mirrors
NPN Current mirrors
Dr. Vincent Chang (張文清)
Multiple Outputs
RVVVVI BEEBEECC
REF21
Dr. Vincent Chang (張文清)
Multiple Emitter Areas
Dr. Vincent Chang (張文清)
Review: Is vs. Emitter Area
ESVv
SC AIeIi TBE npn-BJT physical structure
Dr. Vincent Chang (張文清)
Current Mirror with Multiple Outputs
PNP Current mirrors
NPN Current mirrors
ESVv
SC AIeIi TBE
Dr. Vincent Chang (張文清)
Output Current
REFII 3
PNP Current mirrors
Dr. Vincent Chang (張文清)
Output Current
REFII 3
REFII 35
PNP Current mirrors
Dr. Vincent Chang (張文清)
Output Current
REFII 3
REFII 35
NPN Current mirrors
REFII 24
Dr. Vincent Chang (張文清)
Output Current
REFII 3
REFII 35
NPN Current mirrors
REFII 24 REFII 46
Dr. Vincent Chang (張文清)
WARNING
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