RC串并联选频网络 R 2 1+jOR,C2 R U Z+Z 2 jacI 1+jaR,C2 C Ur (1+n+)+jaRC?DhC、 2 图8.1.4 取R1=R2=R,C1=C2=C,令m0= RC 00 3+j( 88 图 8.1.4 一、RC 串并联选频网络 Z1 Z2 ) 1 (1 ) 1 1 1 1 2 1 1 2 1 2 2 1 1 2 2 1 2 2 2 1 2 2 R C R C C C R R C R C R R C R U U F         + + + − = + + + + = + = = j( j 1 j j f    取 R1 = R2 = R ， C1 = C2 = C ，令 RC 1  0 = 则： 3 j( ) 1 0 0     + − F = 