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opa2344PA跟随问题

Other Parts Discussed in Thread: OPA2344

最近做了个opa2344运用电路 实物测量发现有几个问题不怎么清楚:

A:跟随时(反相输入端)4脚总比(同相输入端)3脚高230mv不知道为什么。

B:当R1接入电路时第一级运放的输入从高电压变到低电压(当然是>2.5v了)发现跟随输出竟然变为0了。当把R1短开时,发现正常跟随(和1所述现象一样)。

麻烦各位前辈给我指点指点,谢谢。