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使用OPA2335，减法电路，采集电流，采样电阻0.2毫欧，采样电阻通过20cm线连接到运放输入，现在电流30A，电阻上6mv，但是测试到运放输入端就是8.5mv，所以导致运放提前达到vcc，请问大家是怎么回事？
