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OPA2607: 双通道运放电流采样问题

Part Number: OPA2607

使用两个运放通道对同一个电流信号做采样,分别作为两个量程计算,放大倍数不同,但同时工作时,输出电压有偏差,分开成两颗运放芯片分别工作时,偏差大幅度减小,这是为什么?