一种微机监控前馈型超干线CATV放大器

Robert M. Blumenkranz
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引用次数: 1

摘要

本文介绍了如何使用微处理器来监测超低失真前馈超干线放大器系统的性能。所描述的方法能够检测前馈级的环路消除中的变化,该变化可能由混合IC中的劣化引起。前馈级的环路消除的减少导致失真水平的增加。通过使用头端微型计算机,信号被发送到位于每个放大器站的转发器,该转发器反过来询问各个前馈放大器级中的每个RF混合IC。通过监测通过将调制引入每个RF混合IC而产生的音调的幅度,在级联的末端指示环路消除的相对程度。在用于测试目的的任何未调制载波上都可以观察到这种音调。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Microprocessor Monitored Feed-Forward Super Trunk CATV Amplifier
This paper describes how a Microprocessor can be used to monitor the performance of an ultra low distortion Feedforward Super Trunk Amplifier System. The method described is capable of detecting changes in the loop cancellation of a Feedforward stage that may be caused by deterioration in the hybrid IC. A reduction in the loop cancellation of a Feed-forward stage results in an increase in the distortion level. Through the use of a Head-End Micro Conputer, a signal is sent to a transponder located in each amplifier station which in turn interrogates each RF hybrid IC in the individual Feedforward Amplifier Stages. The relative degree of loop cancellation is indicated at the end of the cascade by monitoring the amplitude of a tone which is generated by introducing modulation into each RF hybrid IC. This tone is observable on any umodulated carrier used for test purposes.
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