Low Noise Amplifier With 7-K Noise at 1.4 GHz and 25 °C
Low Noise Amplifier With 7-K Noise at 1.4 GHz and 25 °C
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DOI：
10.1109/tmtt.2021.3061459
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发表时间：
2021-04-01
影响因子：
4.3
通讯作者：
Shi, Jun
中科院分区：
文献类型：
--
作者：
Weinreb, Sander;Shi, Jun
这篇文章描述了一种低噪声放大器，它被认为将具有变革性的影响，因为它具有以下特点：1)物理温度为25℃时的噪声温度比典型的商用LNA低4倍；2)在-40℃的温度下，噪声降至4.5K，这一温度可通过固态冷却器实现；3)LNA具有集成的、极其稳定的噪声源，以便于测量系统噪声温度；以及4)放大器由直流电压供电，并由RF输出电缆上的音调信号控制，因此不需要额外的布线。该放大器有利于背景温度较低的低微波频率范围内的系统，如空间通信和射电天文学，但不需要低温系统的资本和维护成本。本文介绍了噪声测量的结构和测试结果，重点介绍了噪声测量的可制造性和准确性。最后，描述了部署低噪声放大器的系统的噪声。
This article describes a low noise amplifier which is believed will have a transformative impact because of the following characteristics: 1) the noise temperature at a physical temperature of 25 degrees C is a factor of 4 lower than typical commercial LNAs; 2) the noise decreases to 4.5 K at a temperature of -40 degrees C, a temperature realizable with solid-state coolers; 3) the LNA has an integrated, extremely stable noise source to facilitate measurement of system noise temperature; and 4) the amplifier is powered by a dc voltage and controlled by a tone signal on the RF output cable thus requiring no additional wiring. The amplifier benefits systems in the low microwave frequency range with low background temperature, such as those for space communications and radio astronomy, but without the capital and maintenance costs of cryogenic systems. This article describes the construction and test results with an emphasis on the manufacturability and accuracy of the noise measurements. Finally, the noise of a system deploying the LNA is described.