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Dr. Vincent Chang (張文清)
LectureIntro to BJT Differential Amplifiers
Vincent Chang
Copyright © by Knowledge Master, Inc.
Vincent Chang
Basics
• Large‐signal analysis
• Transfer characteristic
Mode of operation
• Common mode
• Current switching
• Small‐signal
ICMR
• Concept• Hand analysis
Dr. Vincent Chang (張文清)
Outline
Dr. Vincent Chang (張文清)
I-V Characteristics
TBE VvSC eIi
Q1/Q2: Forward-active
TEB VvvSE eIi )(
11
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E eIi )(2
2
Dr. Vincent Chang (張文清)
I-V Characteristics
Q1/Q2: Forward-active
21 BBD vvv
TEB VvvSE eIi )(
11
TEB VvvS
E eIi )(2
2
TDTBB VvVvv
E
E eeii
)(
2
1 21
Dr. Vincent Chang (張文清)
I-V Characteristics
TDTBB VvVvv
E
E eeii
)(
2
1 21
QEE Iii 21
QE
EE I
iii )1(
2
12
Dr. Vincent Chang (張文清)
I-V Characteristics
TDTBB VvVvv
E
E eeii
)(
2
1 21
QEE Iii 21
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iii )1(
2
12
Dr. Vincent Chang (張文清)
I-V Characteristics
TD VvQ
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i
12
QE
EE I
iii )1(
2
12
TDTBB VvVvv
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QEE Iii 21
Dr. Vincent Chang (張文清)
I-V Characteristics
TD VvQ
E eI
i
12
TDTBB VvVvv
E
E eeii
)(
2
1 21
QEE Iii 21
QE
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iii )1(
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21
Dr. Vincent Chang (張文清)
I-V Characteristics
TD VvQ
E eI
i
12
TDTBB VvVvv
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E eeii
)(
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1 21
QE
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TD Vve /
Dr. Vincent Chang (張文清)
I-V Characteristics
TD VvQ
E eI
i
12TD Vv
QE e
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11
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Dr. Vincent Chang (張文清)
Input File
A BJT Differential Pair (ICMR) * circuit description * Vcc1 3 0 DC 10V Vcc2 11 0 DC -10V Vee 5 0 DC -10V Vd 9 0 DC 0V Rd 9 0 1 Vcm 8 0 DC 0V R1 3 2 10k R2 3 6 10k R3 11 10 19.3k EV1 1 8 9 0 0.5 EV2 8 7 9 0 0.5 * BJT model description Q1 2 1 4 npn_transistor Q2 6 7 4 npn_transistor Q3 4 10 5 npn_transistor Q4 10 10 5 npn_transistor .model npn_transistor npn (Is=1.8E-15 Bf=100 Vaf=300V) * analysis requests .OP .DC Vcm -10V +10V 50mV * output requests .probe
.end
Vincent Chang
Basics
• Large‐signal analysis
• Transfer characteristic
Mode of operation
• Common mode
• Current switching
• Small‐signal
ICMR
• Concept• Hand analysis
Dr. Vincent Chang (張文清)
Outline
Dr. Vincent Chang (張文清)
Current Switching Mode
2QI
Transfer characteristics Current-switching mode
On Off
Dr. Vincent Chang (張文清)
Current Switching Mode
2QI
Transfer characteristics Current-switching mode
On Off
Vincent Chang
Basics
• Large‐signal analysis
• Transfer characteristic
Mode of operation
• Common mode
• Current switching
• Small‐signal
ICMR
• Concept• Hand analysis
Dr. Vincent Chang (張文清)
Outline
Dr. Vincent Chang (張文清)
WARNING
The course contents are protected under thecopyright laws of the United States, Taiwan andother countries. All intellectual property rights ofthe course contents are reserved by KnowledgeMaster, Inc. Any distributing, copying or publicperformance of such course contents, includingPowerPoint slides and audio sound-track, is strictlyprohibited and may subject the offender to severecriminal penalties. (Title 17, United State Code, Section 501 &506)(本课程内容智慧财产权属Knowledge Master, Inc. 所有,并受到美国,台湾等国家著作权法律保护,禁止任何复制与公开播放。)
Copyright © by Knowledge Master, Inc.