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一、前言为解决提高整机接收灵敏度,降低噪声系数的要求,依据小型化、轻量化的原则,笔者在一块25×30mm~2,两块25×20mm~2的高铝瓷片上,利用一四一三研究所研制的低噪声场效应管做成两级C波段低噪声场效应管放大器。在5.1—6.1GHz频段上,获得噪声系数N_F:3～4 db(包括混频器等后级噪声系数在内);增益:G≥12db;1db增益压缩点为4 dbmw的结果。基本上得到了管子所给出的最好指标,达到了国内先进水平。分别在多部整机上试用,效果较好,一般可提高整机接收灵敏度10db左右。大大降低了接收通道对发射功率的要求,缓和了发送功率与接收间的矛盾。本文简要地分析介绍了场效应管放大器设计的基本思想及具体计算方法。
I. Preface In order to solve the requirement of improving the receiving sensitivity and reducing the noise figure of the whole machine, according to the principle of miniaturization and light weight, the author uses one piece of 25 × 30mm ~ 2, two 25 × 20mm ~ Four hundred and thirteen Institute developed a low-noise FET into two C-band low-noise FET amplifier. In the 5.1-6.1GHz frequency band, get the noise coefficient N_F: 3 ~ 4db (including the mixer and other after-class noise figure included); Gain: G ≥ 12db; 1db gain compression point of 4 dbmw results. Basically get the best indicator given by the pipe, reached the advanced level in China. Respectively in a multi-unit trial, the effect is better, the general can improve the receiver sensitivity of about 10db. Which greatly reduces the requirement for the transmit power of the receive channel and relaxes the conflict between the transmit power and the receive. This article briefly introduces the basic idea and specific calculation method of FET amplifier design.