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完全对称型放大器最早是应用于真空管直流放大器中,后来又推广到用MOS—FET、双极型晶体三极管作输出级的功率放大器中。由于依照扬声器的阻抗特性,所以施加负反馈量,所以可发挥出独特的扬声器驱动能力。下面介绍如何将完全对称型电路用于前置放大器,设计出半导体器件数量少、用交流电源供电的完全对称型前置放大器。 一、基本电路的工作原理 完全对称型电路在功率放大器中已获得了应用,这一电路也完全可以在前置放大器中获得应用。 图1是完全对称型功率放大器中最简单的电池供电全场效应管功率放大器的电路。考虑到前置放大器
Fully symmetrical amplifier was first applied to the vacuum tube DC amplifier, and later extended to use MOS-FET, bipolar transistor output stage for the power amplifier. Due to the impedance characteristics of the speaker, negative feedback is applied so that unique speaker driving capability can be exhibited. Here’s how to use a fully symmetrical circuit for the preamplifier, designing a fully symmetrical preamplifier with a small number of semiconductor devices and using AC power. First, the basic circuit works Fully symmetrical circuit in the power amplifier has been applied, this circuit can also be obtained in the preamplifier applications. Figure 1 shows the simplest battery-powered, full-FET power amplifier circuit in a fully symmetrical PA. Consider the preamplifier