之前用过INA121,感觉挺好用的,不过那是电桥输出的信号,做差分放大,很简单。现在我有一个信号,本来是个单端信号,我想使用差分来放大,中间的线比较长,减少些干扰,把信号和地各做为一个输入,这个该怎么设计?我直接把外来的信号和地输入到运放,输出信号并不是原信号放大的。比较杂
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