Low Noise Amplifier With 7-K Noise at 1.4 GHz and 25 °C

被引:16
|
作者
Weinreb, Sander [1 ]
Shi, Jun [1 ]
机构
[1] CALTECH, Pasadena, CA 91125 USA
基金
美国国家科学基金会;
关键词
Temperature measurement; Transistors; Noise measurement; Transmission line measurements; Frequency measurement; Temperature distribution; Current measurement; LNA; low noise amplifier; noise temperature; smart LNA;
D O I
10.1109/TMTT.2021.3061459
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
引用
收藏
页码:2345 / 2351
页数:7
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