一种新型Rail-to-Rail运算放大器的设计与分析

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，使管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。

Design and Analaysis of a Novel Rail-to-Rail Operational Amplifier

In this paper,we put forward a type of Rail to Rail operational amplifier using linear transconductance input stage.The transconductance of input stage is almost not related to the common mode input voltage,but only depends on the processing parameters and operating voltage.Moreover,adoption of the design of composite transistor lead to both uniforming the electric parameters in equivalent NMOS and PMOS,and disgarding the compensational measures due to the diffferences between PMOS and NMOS.All these make simple design feasible.In output stage we use the Class AB CMOS structure,realizing Rail to Rail in it.