CMOS型共源放大器的小信号特性: A(O=-gmiI ds l/ ds2 2Bn (1+Mps)ID adsl t g ds2 MID+n21, B D2 o lds Co=Cbd+Cad2+ CitC bd2 id 1 PCMOS型共源放大器的小信号特性： AV (0)=-gm1r ds1//rds2 =－ 1 2 1 ds ds m g g g + D D n DS D I I V I 1 2 1 2 (1 )     + + ＝－ 2 1 2 1 . 2    + − D n I  r o= rds1//rds2 CO=Cbd1+Cgd2+Cbd2+Cgd1 ) 1 ( 1 1 (0) ( ) ( ) ( ) o o p p v i o v s r C A V s V s A s = + = =  