51频率特性的基本概念 wgo) 1/R 1/R UR+1oL1+7/i√1+(0) 1=A(0)e 1/R A() T=LIR 1+(7) (o)=-arctan=-arctanTo R6 2 1 1/ 1/ ( ) 1 1 ( ) j j I R R e A e U R j L T j T       + + = = = = + + + T L R T R A , / 1 ( ) 1/ ( ) 2 = + =   ( ) arctan arctan L T R     = − = − W j ( )  = 5.1 频率特性的基本概念