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低端用电阻检测电流差分放大还是单端放大好?



我看到TI的方案中低端电流检测用的是运算放大器组成差分放大电路,这个种用单端放大不是更好一些吗?输入阻抗更高了,减小了输出电流在支路上的分流。是还有其他没考虑到的问题吗