序本文主要介绍了参量放大器噪声系数测试的几种方法,以及测试过程中的注意事项。同时,根据被测对象噪声系数的大小,提出了选择标准噪声源的准则。笔者根据情况,对原文略有增删。 This paper introduces several methods of parametric amplifier noise figure testing, as well as the precautions in the testing process. At the same time, according to the noise figure of the measured object, a criterion for selecting a standard noise source is proposed. The author according to the situation, the original additions and deletions slightly.