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在所示电路中,CMOS运算放大器通过P通道HEXFET功率晶体管控制电流,维持其R_1两端恒压。用下式可得到电流I=V_(ref)/R_1
In the circuit shown, the CMOS op amp controls the current through the P-channel HEXFET power transistor, maintaining its constant voltage across R_1. The current I = V ref (ref) / R_1 can be obtained from the following equation