本文针对增益为2 0～ 2 3倍的可编程阶码放大器AD5 2 6集成片，摆脱传统的设计方法，提出一种反馈式程控放大电路。
This paper introduces a special amplifying circuit which can vary the gain from 2 0 to 2 3 in allusion to AD526 chip, throwing out of the traditional method.
并以宽带电流反馈运算放大器为核心，辅以FET输入电路及程控电路构建了高速高输入阻抗可变增益放大电路。
Combined with wide band current feedback amplifier, FET input circuit and programmable circuit, variable gain amplification circuit with high speed and high input impedance is designed.
介绍了程控增益放大器三种电路实现方式，以及这几类电路在电声系统中的应用。
Three kinds of programmable gain amplifier circuit are introduced in this article. Their applications to electro-acoustic system are introduced, too.
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