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 ap-plied 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 mul-tiples of 8 ns,and phase precision adjustment values for different time lengths.The phase approx-imate 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.
Second pulse precision phase shifterDP83640Frequency and phase offsetPrecision phase adjustment
维普
万方数据
