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请教运放的Is问题?

Other Parts Discussed in Thread: LMV552

最近通过贸易商购买了一款运放LMV552,datasheet里说该运放的Is只有60uA,但实际使用后发现,输入端短路的时候电流很小,然后随着输入信号幅值的加大,Is也增大,在输入信号为1Vrms的时候,Is增大到了1.5mA,请问这正常吗?是不是买到假货了?