单边半字节通讯信号的电磁辐射抑制方法

Electromagnetic Radiation Suppression Method for Single Edge Nibble Transmission Signal

摘要: 为了降低单边半字节通讯信号的电磁辐射，本文对该类型通讯信号的电磁辐射抑制方法进行研究。通过分析满足该通讯协议时间要求的不同脉冲波形频谱，结果表明：梯形脉冲相比三角脉冲与抛物线脉冲有较低的电磁辐射。对梯形脉冲进行贝塞尔滤波，将多个滤波后的脉冲进行组合，可构建低电磁辐射的SENT输出信号。本文所提方法能够有效抑制单边半字节通讯信号的电磁辐射，为汽车生产厂商抑制传感器信号电磁辐射以及满足辐射限值要求提供参考方法。

Abstract: In order to reduce the electromagnetic radiation of the Single Edge Nibble Transmission (SENT) sig-nal, this paper studies the electromagnetic radiation suppression method for the SENT signal. By analyzing the spectrum of different pulse waveforms that meet the time requirements of the protocol, the results show that the trapezoidal pulse has better electromagnetic radiation performance than the triangular pulse and the parabolic pulse. The SENT output signal of low electromagnetic radiation can be constructed by combining multiple filtered pulses through Bessel filtering of trapezoidal. In this paper, the proposed method can effectively suppress the electromagnetic radiation of the SENT signal and provides a reference method for automobile manufacturers to suppress the electromagnetic radiation of the SENT signal and meet the radiation limit requirements.