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关于运放的几个问题?

Other Parts Discussed in Thread: OPA348, LMV611

各位大大,我用的MCP6001是轨到轨的,但是这款运放10HZ时和400HZ时的增益相差太大无法使用(10mV的输入信号,10HZ输入时放大输出200mV,400HZ输入时放大输出只有20mV),可否使用一款合适的轨到轨运放可使增益不这么漂?需要看DATASHEET中的哪些参数?谢谢了