2一阶低通 H(S) SC R+ 1 Rc s t SC Rc M Ha) /9 Me 1 (H(jOM2.一阶低通 ( ) 1 v t ( ) 2 v t Rc s Rc sc R sc H s 1 1 1 1 1 ( ) + = + =  M1 1       = = − = = , 1 ( ) 1 ( ) 1 1 2 1 M H j e v v M e H j j j