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求助:OPA355 output low level 离GND有offset

Other Parts Discussed in Thread: OPA355

原理图如下,OPA355用作跟随器增加驱动能力。Vin+输入300KHz方波,swing为0~1.1V。output端没有接loading,量测的方波信号low level为50mV(离GND有个正向 50mV offset),请问这个offset有办法消除吗?