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高性能的输出级是运算放大器和功率放大器的重要组成部分,AB类输出级因其具有高转换效率和低失真的特性而被广泛应用。对于标准双极工艺,NPN晶体管的工作频率远高于PNP晶体管。本文采用全NPN晶体管实现了一种高速、宽输出电压摆幅的输出级,可以达到更高的工作频率,能够满足高速和宽带的需求。该输出级还具有输出短路电流保护、全电源电压保护和ESD保护功能,已应用到某运算放大器的设计中。经测试验证,可满足信号处理的要求。
High-performance output stage is an important part of the op amp and power amplifier, class AB output stage because of its high conversion efficiency and low distortion characteristics are widely used. For standard bipolar processes, NPN transistors operate much faster than PNP transistors. In this paper, an all NPN transistor is used to realize a high-speed, wide-output voltage swing output stage, which can achieve higher operating frequency and meet the requirements of high-speed and broadband. The output stage also features output short-circuit current protection, full supply voltage protection and ESD protection, which has been applied to the design of an operational amplifier. After testing to meet the signal processing requirements.