八、NMOS 集成运放的输出级当具有电阻负载和大的容性负载时,就有必要考虑在运放电路中加设输出级,以便使负载不致减小运放的增益或影响它的闭环稳定性。当将一个模拟信号由硅片送到外部环境中时常常会出现这种需要。在设计这类输出缓冲器时要求实现足够宽的带宽以便使放大器的闭环稳定性不会由于缓冲器的相移而恶化。于是常常选用单位增益跟随器组态。输出缓冲器通常分成两大类:A 类与AB 类。图 Eight, the integrated output stage of the NMOS op amp When having a resistive load and a large capacitive load, it is necessary to consider adding an output stage op amp circuit, so that the load will not reduce the op amp gain or affect its closed loop stability. This is often the case when sending an analog signal from the silicon to the outside environment. The design of such an output buffer requires a sufficiently wide bandwidth so that the closed-loop stability of the amplifier does not deteriorate due to the buffer’s phase shift. So often choose unity gain follower configuration. Output buffers are usually divided into two broad categories: Class A and Class AB. Figure