2、输入信号 差模信号:un1=-u12 id i1-u ui= 1/uid 2=-12id 共模信号:un=u2=lo 1/2(un+u2) 比较输入:n=1/2u;a+ua i2=-1/uid tuic 2021/2/20 电工电子学B2021/2/20 电工电子学B 2、输入信号 差模信号： ui1 =- ui2 uid = ui1 - ui2 ui1 = 1/2uid ui2 = -1/2uid 共模信号：ui1 = ui2 =uic uic = 1/2( ui1 + ui2 ) 比较输入：ui1 = 1/2uid+uic ui2 = -1/2uid+uic