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Microelectronic Circuits - Fifth Edition Sedra/Smith Copyright 2004 by Oxford University Press, IncFundamentals of Microelectronics Behzad Razavi Copyright 2009 by John Wiley & Sons, Inc
Small-Signal Model
Em
Cm
in
out
EmEmREin
EmRE
Cm
out
C
outm
Rgr
Rgvv
Rgr
vRvgrvvvvv
Rvgrvv
Rgvv
Rvvg
11
11
,
then, rgm /11
이득감소
Small-Signal Model
Interestingly, this gain is equal to the total load resistance to ground divided by 1/gm plus the total resistance placed in series with the emitter.
Em
Cv
Em
Cmv
Rg
RA
RgRgA
1
1
gmRE >>1인 경우, Av는 IC에 의존하지 않는다.
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