一种基于电荷泵锁相环的高精度数字移相方法

移相器是相控阵雷达的核心器件，随着工作频率的逐步提升，传统移相器的插入损耗和相位控制误差恶化严重，导致额外增加的功耗及波束性能变差.本文基于电荷泵锁相环（Charge Pump Phase-Locked Loop，CP-PLL）开展了高精度数字移相方法的研究.在分析CP-PLL相位数学模型与移相机理的基础上，提出了通过数控电流源的方法实现对输出信号相位的精确控制，建立电路模型开展仿真分析，并设计了实验电路模块，通过仿真和实测的对比验证了该方法的有效性和精确性，实现了移相步进优于1°，移相精度优于移相值的10%.该CP-PLL可通过作为本振信号或直接产生发射信号应用于相控阵雷达系统中，具有精度高、功耗低、易集成等特点，从而取代移相器，有效提升相控阵雷达的性能.

A High Precision Digital Phase Shift Method Based on Charge Pump Phase-Locked Loop

Phase shifter is the core device of phased array radar(PAR).With the gradual increase of the working frequency,the insertion loss and phase control error of the traditional phase shifter get worsen seriously,resulting in additional power consumption and poor beam performance.In this paper,a high-precision digital phase shifting method based on CP-PLL is investigated.Based on the analysis of CP-PLL mathematical model and phase-shifting mechanism,the method of numerical control current source is proposed to realize the accurate control of the output signal phase,the circuit model is established to carry out simulation analysis,and the experimental circuit module is designed.The effectiveness and accuracy of the method are verified by the comparison of simulation and measurement.The results show that the phase-shifting step is better than 1°,and the accuracy is better than 10% of the phase-shifting value.The CP-PLL can be used in PAR as a local oscillator or as a direct transmitter signal.It has the characteristics of high precision,low power consumption and easy integration,which can replace the phase shifter and effectively improve the performance of PAR.