中图分类号：TN79 文献标志码：A DOI: 10.16157/j.issn.0258-7998.234500
中文引用格式：秘志贺，郑宏斌. 一种低峰均功率比的数字梳状谱模块设计[J]. 电子技术应用，2024，50(5)：13-18.
英文引用格式：Mi Zhihe，Zheng Hongbin. Design of a digital comb spectrum module with low peak to average power ratio[J]. Application of Electronic Technique，2024，50(5)：13-18.

Design of a digital comb spectrum module with low peak to average power ratio

Abstract：In order to improve the calibration efficiency of inter-channel error of multi-channel receiver，a digital comb spectrum calibration source module with low peak to average power ratio(PAPR) is designed and implemented. This module is based on the hardware structure of FPGA+DAC and uses the DDS principle to generate comb spectrum signal. In order to reduce the PAPR of the comb spectrum signal, the genetic algorithm is used to optimize the initial phase of each subcarrier of the signal, and a group of initial phase combination which is better than the algebraic suboptimal solution is calculated. The PAPR is reduced from 4.98 dB of the suboptimal solution to 3.98 dB, and the subcarrier power and outside pass-band spur suppression of the comb spectrum signal are improved, optimizing the signal quality of the comb spectrum module. When the output range of the comb spectrum signal is170 MHz ~230 MHz with the spectrum interval of 1 MHz, the subcarrier power is -35.5 dBm and the outside pass-band spur suppression is 64 dBc, which fully meets the requirements of the calibration source.

Key words :comb spectrum；genetic algorithm；peak to average power ratio；FPGA