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本文讨论了混频二极管在直流偏置和交流信号激励时的噪声温度比,提出了以“有效噪声温度比(tD)_(eff)”来表征二极管在交流激励下的噪声性能.文中还讨论了在信号及镜像频率的变频损耗不同时混频器输出噪声温度比和二极管噪声温度比的关系.根据分析结果对倒极性并联二极管对的噪声性能作了分析,表明这种复合管的(tD)_(eff)为一常数(0.5).这对降低混频器的系统噪声系数是十分有利的.可以相信:利用倒极性并联二极管对于研制优良性能的毫米波段混频器是一种很有希望的办法.
In this paper, we discuss the noise temperature ratio of the mixing diode when the DC bias and the AC signal are excited, and propose that the effective noise temperature ratio (tD) eff is used to characterize the noise performance of the diode under AC excitation. The relationship between the output noise temperature ratio of the mixer and the diode noise temperature ratio is analyzed when the conversion loss of the signal and the image frequency are not the same.The noise performance of the inverting parallel diode pair is analyzed according to the analysis results, tD) _ (eff) is a constant (0.5), which is very beneficial for reducing the mixer’s system noise figure.It is believed that the use of an inverting parallel diode is a good example of a millimeter-band mixer Very promising way.