第5章频率响应 8mR be B。R uls r+ r+ (5-25a) be e H R'C (5-25b) us O (5-26 1+( H q(0)=-180- arctan() (5-27 △q=- arctan( (5-28)第5章 频率响应 arctan( ) ( ) 180 arctan( ) 1 ( ) ( ) 1 2 2 H H o H uIs u s i H H s b e o L s b e b e uIs m L f f f f j f f A A j R C f R r R R r r A g R  = − = − − + =  = = +  = − + = −          (5―25a) (5―25b) (5―26) (5―27) (5―28)