UC(S 例求图示电路的网络函数H(S)=Us(S) R S C 亿sS)1CUS) H(S=C(S) U,(s).1 Ucs r+ C UC(S)- SC H(S)I(S) r+ 1 RSC +1 SC( ) ( ) ( ) U S U S H S S C = SC R SC 1 1 + = 1 1 + = RSC R C + _ + _ uS uc R 1/SC + _ + U _ S (S) UC (S) 例 求图示电路的网络函数 sC sC R U s U s s C 1 1 ( ) ( )  + = ( ) ( ) ( ) U S U S H S S C = ( ) ( ) ( ) U S U S H S S C =