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又有问题

Other Parts Discussed in Thread: INA156, OPA2350

这是一个热电偶的信号调理电路,问题:当模拟开关选择一倍放大电阻时偏执略小于1V(等于我的偏执电压Vmid),随着放大倍数的增加(反馈电阻增大)到八倍时(6.8K)输出偏置电压几乎降到0。专家认为是什么原因那?

单电源温度.pdf