北大微电子:模拟集成电路原理 带电阻负载的共源级 DD 妄R R = R M R=R川‖R out (RD‖lr g R=-gm(R‖l ≈-gmRD(RD<< v②9 o幸月D北大微电子：模拟集成电路原理 带 负载的共源级 电阻负载的共源级 R Rup = RD Rdown Rup R R R R r R r out up down D o down o = = = || ( || ) g R g R r V V m out m D o i out p = − = − ( || ) g R (R r ) V m D D o in ≈ − <<