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如图所示，单电源供电时，无法正常放大，照理来说是放大了13倍，输出应该是1.32V，但一直431mV；双电源供电可以正常工作，INA126是不是只能双电源供电，求指教！
那想问一下，其A2运放的共模电压范围是用这个公式计算的吗
