基于DP83640的秒脉冲移相器设计与实现

使用DP83640 IEEE 1588精密时间协议（PTP）收发芯片设计实现了一款秒脉冲精密移相器，它能与外部的标准秒脉冲（1 PPS）进行同步并进行精密相位微调，可应用于高精度相位微跃器。秒脉冲移相器采用DP83640芯片进行级联实现秒脉冲精密移相：利用ARM微处理器控制第二级DP83640实现与外部标准秒脉冲的相位粗调，控制第一级DP83640实现相位微调。相位调整时将外部输入的相位偏移量换算为8 ns整周期倍数的相位粗调值，以及不同时间长度档位的相位微调值，分别写入第二级和第一级DP83640共同实现高精度相位微跃。由于硬件电路特性和器件综合噪声的影响，经测试平均相位微跃准确度可以达到0.1 fs。

Design and implementation of second pulse phase shifter based on DP83640

The DP83640 IEEE 1588 precise time protocol (PTP) transceiver chip is used to design a pulse-per-second precision phase shifter, which is synchronized with the external standard pulse per second (one pulse per second, 1 PPS) and perform precise phase adjustment, and can be applied to high-precision frequency and phase offset generator. It uses the DP83640 chip cascade to realize 1 PPS precision phase shift. The ARM microprocessor controls the second-stage DP83640 to realize the approximate adjustment of the phase with the external standard second pulse, and controls the first-stage DP83640 to realize the precise phase adjustment. For phase adjustment, the externally inputted phase offset is converted into a phase approximate adjustment value in multiples of 8 ns, and phase precision adjustment values for different time lengths. The phase approximate adjustment value and the precision adjustment value are written to the second stage and the first stage DP83640 together to realize high-precision phase adjustment. Due to the influence of hardware circuit characteristics and device comprehensive noise, the average frequency and phase offset precision can reach 0.1 fs after testing.