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关于LMV358使用的问题

Other Parts Discussed in Thread: LMV358, LM358, TLV2333

我的输入信号有点小,最小0.2mv左右,为了获得较好的放大效果把lm358换成了lmv358,没想到,lmv358的输入端直接抬高到了1mv左右,换回去lm358就正常了,这个是为什么??还是我买到假货了??谢谢,请指教。