重频超宽带脉冲对混频器的干扰特征分析

Interference Effects of Repetitive Ultra-wideband Pulses on Mixer

摘要:

重频超宽带脉冲可对多种电子设备与电子器件产生干扰。针对电子器件的干扰效应,着重从仿真分析和实验两方面研究了重频超宽带脉冲对无源混频器的干扰特征。分析了混频器对超宽带脉冲信号的响应特性,给出了不同参数条件下重频超宽带脉冲信号对混频器及混频滤波电路的干扰特征。研究表明,作为干扰信号,重频超宽带脉冲信号并不能影响混频器正常工作；当重频超宽带脉冲信号与通信信号一起注入混频器时,混频器可实现其正常的变频功能,而作为衡量混频器工作性能的重要指标,变频损耗可认为基本不变；重频超宽带脉冲信号经过混频滤波电路后变为同中频信号同样频率的连续波信号,其对混频滤波电路的干扰以及之后电路的干扰类似定频连续波信号干扰。

Abstract:

Repetitive ultra-wideband pulses can interfere many kinds of electronic devices. For the interference effect on electronic devices, this paper mainly studied interference characteristics of repetitive ultra-wideband pulses on passive mixer through simulation analysis and experiments. The mixer response characteristics to repetitive ultra-wideband pulses are analyzed in this paper, and interference characteristics of the mixed filtering circuits caused by repetitive ultra-wideband pulses of different parameters are manifested. According to the study, repetitive ultra-wideband pulses can’t interfere the mixer while working as interfering signal. When repetitive ultra-wideband pulses and communication signals are injected to the mixer together, frequency conversion function of the mixer can be achieved, and as an important indicator to measure the service behavior of the mixer, the converter conversion loss can be basically considered to maintain invariable. Repetitive ultra-wideband pulses turn into a continuous wave which shares the same frequency as IF signal after passing the mixed filtering circuits, whose interference to the mixed filtering circuits and the circuits after is similar to a fixed frequency continuous wave signal interference.