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给出计算射频前端噪声系数的公式,指出改善射频前端噪声量级的途径,概述射频前端的发展及现状,着重介绍目前在微波放大器、混频器及本机振荡器方面的研究动向。
The formula to calculate the RF front - end noise figure is given. The way to improve the RF front - end noise level is pointed out. The development and status quo of the RF front - end are summarized. The research trends in microwave amplifiers, mixers and local oscillators are emphatically introduced.