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Phase Difference Measurement Method Based on Progressive Phase Shift

School of Aerospace Science and Technology, Xidian University, Xi’an 710071, China
Key Laboratory of Electronic Equipment Structure Design, Ministry of Education, Xidian University, Xi’an 710071, China
Author to whom correspondence should be addressed.
Electronics 2018, 7(6), 86;
Received: 15 May 2018 / Accepted: 30 May 2018 / Published: 1 June 2018
PDF [12391 KB, uploaded 1 June 2018]


This paper proposes a method for phase difference measurement based on the principle of progressive phase shift (PPS). A phase difference measurement system based on PPS and implemented in the FPGA chip is proposed and tested. In the realized system, a fully programmable delay line (PDL) is constructed, which provides accurate and stable delay, benefitting from the feed-back structure of the control module. The control module calibrates the delay according to process, voltage and temperature (PVT) variations. Furthermore, a modified method based on double PPS is incorporated to improve the resolution. The obtained resolution is 25 ps. Moreover, to improve the resolution, the proposed method is implemented on the 20 nm Xilinx Kintex Ultrascale platform, and test results indicate that the obtained measurement error and clock synchronization error is within the range of ±5 ps. View Full-Text
Keywords: phase difference measurement; progressive phase shift; field programmable gate array; programmable delay line phase difference measurement; progressive phase shift; field programmable gate array; programmable delay line

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Zhang, M.; Wang, H.; Qin, H.; Zhao, W.; Liu, Y. Phase Difference Measurement Method Based on Progressive Phase Shift. Electronics 2018, 7, 86.

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