一种可变增益控制放大器

A Variable Gain Control （VGC） Amplifier

通过对目前有线电视分配网络中放大器的增益和斜率控制所使用的各种方法进行分析和比较,提出了一种新的控制方案,就该方案中使用的新器件和一种可变增益控制（VGC）放大器的具体实现方法作了介绍,其中包括这种放大器的主要特点和整机设计要点.

Firstly, analysis and comparison of the methods which are used to control the gain and slope of the amplifier for CATV distribution network system are presented in this paper. Then, a new control scheme is brought forward. Several new devices used in the scheme, a Variable Gain Control （VGC） Amplifier and its realizing method are also presented, including the main features and essential designs of the amplifier.