Multichannel time-to-digital converters with automatic calibration in Xilinx Zynq-7000 FPGA devices

Wang, Yu and Xie, Wujun and Chen, Haochang and Li, David Day-Uei (2021) Multichannel time-to-digital converters with automatic calibration in Xilinx Zynq-7000 FPGA devices. IEEE Transactions on Industrial Electronics. ISSN 0278-0046

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    Abstract

    This paper proposes a weighted histogram method and an automatic calibration architecture to implement high-linearity time-to-digital converters (TDCs) 16 in low-cost advanced RISC machine (ARM)-based field-programmable gate arrays (FPGAs). The proposed method significantly reduces nonlinearity induced by nonuniform bins. It offers automatic calibration without manual interventions using ARM processors. Besides, our design is cost-effective in hardware consumption. We implemented and evaluated a 32-channel TDC system in a low-cost Zynq-7000 ARM-based FPGA, in which the programable logic is equivalent to a 28 nm Artix-7 FPGA. The proposed TDC offers a resolution of 9.83 ps (LSB = 9.83 ps) with good uniformity, achieving an averaged peak-peak differential nonlinearity (DNLpk-pk) of 0.27 LSB, and an averaged peak-to-peak integral nonlinearity 28 (INLpk-pk) of 0.67LSB.

    ORCID iDs

    Wang, Yu, Xie, Wujun ORCID logoORCID: https://orcid.org/0000-0003-0483-8639, Chen, Haochang ORCID logoORCID: https://orcid.org/0000-0001-6196-4418 and Li, David Day-Uei ORCID logoORCID: https://orcid.org/0000-0002-6401-4263;