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.
关键词
秒脉冲精密移相器/DP83640/相位微跃/精密相位调整
Key words
Second pulse precision phase shifter/DP83640/Frequency and phase offset/Precision phase adjustment
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