In this endeavor, a cascade system of an attenuator in series with a Low Noise Amplifier (LNA) will be studied. A discussion on past related works followed by a study of different Attenuator-LNA arrangements not analyzed collectively in those previous works will be presented. This is important for addressing the lowering of system noise figure (NF), which is critical for applications such as GPSs and Radars. The effects of the attenuator on the overall NF will be looked at. The attenuator can also act as a protection for the spectrum analyzer from Device Under Test (DUT) which in this case is an LNA.

中文翻译：

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带有衰减器的LNA级联网络的RF特性综述

为此，将研究与低噪声放大器（LNA）串联的衰减器的级联系统。将对过去的相关工作进行讨论，然后研究在以前的工作中未共同分析过的不同的Attenuator-LNA布置。这对于解决降低系统噪声系数（NF）至关重要，这对于GPS和雷达等应用而言至关重要。将研究衰减器对总NF的影响。衰减器还可以充当被测设备（DUT）的频谱分析仪的保护，在这种情况下，被测设备是LNA。