电流放大倍数的频率特性曲线 0.707 1+ fe o=tgI B f<f时,B≈ 45 90° =时,B=1=0707 45 f>/时,B|≈·月 →时,→0,9→-90电流放大倍数的频率特性曲线 = − + = + = f f f f f f 1 2 0 0 tg 1 ( ) 1 j - → → → = = = 0 -90 0.707 -45 2 0 0 0 0 时, , 时, 时, , 时, f f f f f f f f f o