直流偏移对瞬变电磁信号影响的分析

Analysis of DC Offset Influence on Transient Signal

基于瞬变信号的特点和接收机中浮点数据采集电路的原理,文章对直流偏移对瞬变信号的影响进行了分析。通过对浮点数据采集电路中浮点放大电路原理的分析、直流偏移极限值的计算和直流偏移存在时波形的仿真,得出直流偏移会导致瞬变信号产生奇异点和饱和畸变,同时对比讨论了同一理论曲线中、不同理论曲线中和实测瞬变信号中畸变形态的分布。最后,针对波形畸变的主要原因,给出了相应的解决方案。本文的研究可为浮点放大技术接收机的调试工作和波形畸变问题的分析提供参考依据。

Based on the characteristic of transient signal and the principle of floating-point data acquisition circuit,the influences of DC offset on transient signal are analyzed.And the conclusion can be obtained that the singularity and saturation distortions in transient signals can be produced by DC offset through the detailed principle analysis,the limits calculation of DC offset,and waveform simulation while the DC offset is present in floating-point amplifier circuit of floating-point data acquisition circuit.At the same time,the distributions of distortions in those conditions that the single and several theoretic transient signals and also in actual measured transient signal are compared and discussed.Finally,the corresponding solutions are given according to the main factors which produce the waveform distortion.In a word,this research can provide useful references for the adjustment of floating-point receiver and the analysis of waveform distortion.