在各种音频放大器中,改进其高频参数和提高可靠性常常是必需的.这些特性主要由其输出级决定,而且是互相矛盾的.本文将讨论输出级及其对于功率带宽的影响,特别是输出晶体管的基极充电或者基极——发射极寄生电容对高频电路参数的影响,克服这些影响的有效方法,以及转换速度对可靠性的限制,和高频时的畸变. Often it is necessary to improve the high frequency parameters and improve the reliability of various audio amplifiers, which are mainly determined by their output stages and are in contradiction with each other.In this paper, the output stage and its effect on power bandwidth are discussed in detail Is the effect of base-emitter or base-emitter parasitic capacitances of output transistors on high-frequency circuit parameters, effective methods of overcoming these effects, and limitations on the reliability of the slew rate, as well as distortion at high frequencies.