A push - pull output stage was used in the circuit to extend output voltage from rail to rail and a class ab biasing is used to improve the power efficiency of the circuit 輸出級采用共源結(jié)構(gòu)的互補推挽輸出結(jié)構(gòu),提高了輸出電壓的動態(tài)范圍。并使用甲乙類的輸出結(jié)構(gòu),提高了電路的功率效率。