单电源供电的电路（图一中右）运放的电源脚连接到正电源和地。正电源引脚接到 ... 单电源工作的运放需要外部提供一个虚地，通常情况下，这个电压是VCC/2，图二-Single power supply circuit (Figure 1 right) foot power operational amplifier connected to the positive supply and ground. Supply pins are received ... the work of single-supply op amp needs to provide a virtual external, the normal circumstances, this voltage is VCC/2, Figure II