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想问下这个电路U1A运放同相端的R1电阻到底有什么作用啊?很郁闷。
我记得以前曾经看到一个文章, 讲运放俩输入信号阻抗匹配的影响问题.
但也有说不需要严格匹配. 应该跟这里的问题有关, 可以查一下这个方面的介绍