星载低噪声放大器噪声系数的高精度测试方法研究  

The research on high-accuracy noise figure measurement method for space-borne low noise amplifiers

作　　者：康红霞 杨宁彬 高妍[1] 杨晓敏[1] KANG Hongxia;YANG Ningbin;GAO Yan;YANG Xiaomin(China Academy of Space Techtechnology(Xi'an),Xi'an 710000,China)

机构地区：[1]中国空间技术研究院西安分院,西安710000

出　　处：《空间电子技术》2021年第2期35-40,共6页Space Electronic Technology

基　　金：民用航天技术预研项目(编号:D040301)。

摘　　要：噪声系数是低噪声放大器的关键指标,它决定了系统的噪声性能。然而现有的测量方法不能修正失配和噪声参数误差,只能给出基于源阻抗的噪声系数。为了提高低噪声放大器噪声系数的测量精度,文章基于矢网冷源噪声系数测试方法,给出优选的矢量噪声校准法,并提出5项重要技术措施以进一步提高低噪声放大器噪声系数的测量精度。相比Y因子法,矢网冷源噪声系数测试方法可以修正失配和噪声参数误差,给出系统阻抗为50Ω时的噪声系数。实验测试结果表明,在14.25 GHz,矢网冷源噪声系数测试方法的测量不确定度为0.17 dB,相比Y因子法测量不确定度0.38 dB,测量精度显著提高,进一步满足了高精度的测试要求。The noise figure is a key indicator of low noise amplifiers(LNA),which determines the noise performance of communication systems.However,the existing measurement methods only provide the noise figure based on the source impedance but cannot remove the mismatch and noise-parameter-error.In order to improve the measurement accuracy of the LNA noise figure,based on the VNAs-cold source method,the authors propose optimal vector noise calibration method and 5 key technical countermeasures to further improve the measurement accuracy.Compared to the Y factor method,the VNAscold source method greatly reduce mismatch and noise-parameter-error and give the noise figure when the system reference impedance is 50Ω.Our test results reveal that in the case of 14.25 GHz the measurement uncertainty of the VNAs-cold source method is 0.17 dB,and the Y-factor method,which is relatively accurate among conventional test methods can only achieve 0.38 dB.Therefore,by invoking the VNAs-cold source method and the proposed technical countermeasures,the measurement accuracy is significantly improved,which further meets the high-precision test requirements.

关 键 词：低噪声放大器 噪声系数 矢网冷源法 高精度 

分 类 号：TN407[电子电信—微电子学与固体电子学]