Journal of Atmospheric and Environmental Optics, Volume. 16, Issue 6, 553(2021)
Design and Implementation of Phase Shift Clock Digital Interpolation TDC Circuit Based on FPGA
In order to achieve high-precision ground detection of time sequential signals of aerospace equipment, a special ground test system based on field programmable gate array (FPGA) is designed, and time-to-digital converers (TDC) is the key component of the system. The circuit adopts digital interpolation technology, where high-frequency clock is used to directly count for “coarse” measurement to ensure the measuring system range, and “fine” measurement is achieved by latching the phase shift clock level at the edge of the signal to be measured to improve the measurement accuracy. The sources of measurement errors is analyzed and the corresponding solutions are put forward. Through experimental verification, it is shown that the measurement resolution of the circuit meets the design value of 0.2 ns, and the measurement uncertainty caused by the repeatability is less than 0.1 ns. The circuit has high measurement accuracy, good flexibility and convenient design, and can meet the application requirements of related detection systems.
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LIU Jingyan, LU Meina, WANG Yi, CAI Weijie, SONG Maoxin, HONG Jin. Design and Implementation of Phase Shift Clock Digital Interpolation TDC Circuit Based on FPGA[J]. Journal of Atmospheric and Environmental Optics, 2021, 16(6): 553
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Received: Jun. 3, 2020
Accepted: --
Published Online: Feb. 11, 2022
The Author Email: Jingyan LIU (jyliu18@mail.ustc.edu.cn)