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您好,参考图里面是-1v供电的,我在设计的时候应用的是5V供电。。。。同相放大就是放大了,之所以第二级用反向是因为压阻薄膜阻值变化范围较大,担心经过第一级的反向放大处理后超过ADC的最大允许输入电压,所以想利用第二级可以调节。。。。