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전자 회로 1Lecture 7 (MOSFET-II)
2009. 05.임한조
아주대학교 전자공학부[email protected]
이 강의 노트는 전자공학부 곽노준 교수께서 08.03 에 작성한 것으로 노트제공에 감사드림 .
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Review (operation mode)
NMOS PMOS
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MOSFET at DC
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CMOS inverter
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Large signal operation
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Saturation mode:
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Biasing in MOS Amp.
Amp 주로 Saturation 영역을 이용함 Cf) Inverter: Cutoff + Triode
Solution: Degeneration Resistance in the Source
온도의 함수 소자마다 다름
: negative feedback
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Degeneration Resistance in the Source
Large Rin
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Drain-to-Gate Feedback Resistance
Limited output voltage swing
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Constant Current Source
Current mirror
R 을 조정함으로써 IREF 를 적절히 조절
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Small signal operation
DC bias point (Q-point)
Total Current iD
소신호 모델 = 매우 작음
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Transcoductance & Voltage gain Transconductance
Voltage Gain ( 전압이득 )
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Small signal models (hybrid-π & T)
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Channel-length Modulation (ro) BJT 의 Early effect 모델과 비슷함 ro를 추가
참고 : large signal model 과 gm 이 다름
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Body effect 고려 Source 가 Body 와 같은 전위가 아닐 때 사용
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Summary: Small Signal model (I)
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Summary: Small Signal model (II)
SBsmall-signal Equivalent Circut Model when V 0 (i.e., No Body Effect)
SBsmall-signal Equivalent Circut Model when V 0 (i.e., Including Body Effect)
