基于时钟扩频技术改善车载终端中频辐射骚扰

摘要

为了解决接地、滤波和屏蔽等传统的电磁兼容处理措施的不足，采用扩频技术对系统时钟波形进行调制，通过产生一个具有边带谐波的频谱，将已有的窄带时钟调制到更宽的频谱，同时降低基频和谐波的峰值频谱能量。文章对扩频技术应用原理及影响因素进行分析，结合车载电子终端中频辐射骚扰测试实例，证明时钟扩频技术可以有效地改善车载电子电磁兼容性能。%In order to solve the insignificance of traditional treatment measures of compatibility like as grounding, shield and filter, using spread spectrum technology to modulate of the system clock waveform is presented. By generating a spectrum sideband harmonics, the narrowband are modulated as a wider spectrum of clock, the peak spectral energy of the fundamental and harmonics also can be reduced at the same time. The article analyze the application of spread spectrum technology principle and influence factors, combined with a radiated disturbance test example of the vehicular electronic terminal, to prove that clock of spread spectrum technology can effectively improve the electromagnetic compatibility of automotive electronics.