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首页> 外文期刊>IEEE instrumentation & measurement magazine >Noise-Parameter Measurements of Very-Low-Noise Amplifiers at Ambient and Cryogenic Temperatures
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Noise-Parameter Measurements of Very-Low-Noise Amplifiers at Ambient and Cryogenic Temperatures

机译：环境和低温温度下极低噪声放大器的噪声参数测量

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Radio-telescope receivers are developed to sense very weak astronomical signals. The sensitivity of a radio telescope is inversely proportional to its noise temperature, which is largely dependent on the amount of noise generated in the receiver low-noise amplifier (LNA). In addition, a radio telescope sensitivity is also proportional to its collecting area; however, it is very costly to enhance sensitivity by increasing the collecting area. Given the high costs associated with increasing the collecting area, the development of methods of reducing LNA noise becomes critical to optimizing the operation of radio telescopes. Such LNA-noise reduction techniques must first be verified via laboratory measurements and then subsequently verified using field measurements on the telescope.
机译：开发出射电望远镜接收器以感测非常弱的天文信号。无线电望远镜的灵敏度与其噪声温度成反比，这在很大程度上取决于接收器低噪声放大器（LNA）中产生的噪声量。此外，无线电望远镜敏感性也与其收集区域成比例;然而，通过增加收集区域来提高灵敏度是非常昂贵的。考虑到与增加收集区域相关的高成本，降低LNA噪声的方法的发展对于优化无线电望远镜的操作变得至关重要。必须首先通过实验室测量验证这种LNA降噪技术，然后在望远镜上使用现场测量进行验证。

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