本文重点介绍了KD1411的以下三个主要特点：（1）增益可编程控制的微弱信号放大器的设计；
This paper lays stress on the description of the three main features of KD1411: 1. the design of weak signal DC amplifier with programmable gain;
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.
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