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共模电压指的是两个输入电压的平均值，它影响输入/输出电压的摆幅限制，比如对于OPA140, 数据手册上Common-Mode Voltage Range min :（V-）-0.1 max: (V+)-3.5V 而正负电源分别为+5、0V，而0-0.1=-0.1V 到 5-3.5=1.5V 所以这个运放的输入电压范围为-0.1V~1.5V。
