二、U(@)与Uc(o)的频率特性 U(in= j袒 U, +j0-) 17 Uc(jn) -j2 0 n+j0(12-1) Ҽǃ UL (Z)оUC (Z)Ⲵ仁⦷⢩ᙗ 2 ( ) ( 1)      C s U j jQ U jQ Ș K K 2 ( ) ( 1)      C s U j jQ U jQ Ș K K 2 ( ) 1 1 (1 )     L s U j jQ U jQ Ș K K 2 ( ) 1 1 (1 )     L s U j jQ U jQ Ș K K