提出了一种采用线性跨导输入级的Rail-to-Rail运算放大器,输入级的跨导基本实现了与共模输入电压无关,而只与工艺参数和工作电压有关。采用了复合晶体管的设计,使等效NMOS和等效PMOS的电学参数一致,摈弃了由于PMOS及NMOS的不一致性而采取的补偿措施,输出级采用甲乙类CMOS结构,实现了输出的Rail-to-Rail A Rail-to-Rail operational amplifier with a linear transconductance input stage is proposed. The transconductance of the input stage basically has nothing to do with the common mode input voltage, but only with the process parameters and operating voltage. The design of the compound transistor is adopted to make the equivalent NMOS and equivalent PMOS electrical parameters consistent. The compensation measures taken due to the inconsistencies of PMOS and NMOS are rejected. The output stage adopts Class A and B CMOS structures to realize the output Rail-to -Rail