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OPA2350输入是uA级电流能否放大

Other Parts Discussed in Thread: OPA2350

各位大神,用OPA2350搭了一个15倍的差分放大电路,采样电阻是100欧,当电流是15uA时,放大有时是35倍有时是7倍,而电流是3mA的时候就是稳定的15倍,麻烦看下是什么问题呗,谢谢