128-channel high-linearity resolution- adjustable time-to-digital converters for LiDAR applications: software predictions and hardware implementations

Wujun Xie, Yu Wang, Haochang Chen, David Li

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Abstract

This paper proposes a new calibration method, called the mixed-binning (MB) method, to pursue high- linearity time-to-digital converters (TDCs) for light detection and ranging (LiDAR) applications. The proposed TDCs were developed using tapped delay-line (TDL) cells in field- programmable gate arrays (FPGAs). With the MB method, we implemented a resolution-adjustable TDC showing excellent linearity in Xilinx UltraScale FPGAs. We demonstrate a 128-channel TDC to show that the proposed method is cost-effective in logic resources. We also developed a software tool to predict the performances of TDL-based TDCs robustly. Results from both software analysis and hardware implementations are in a good agreement and show that the proposed design has great potential for multichannel applications; the averaged DNLpk-pk and INLpk-pk are clowe to or even less than 0.05 LSB in multichannel designs.
Original languageEnglish
JournalIEEE Transactions on Industrial Electronics
Publication statusAccepted/In press - 17 Apr 2021

Keywords

  • 128-channel
  • high-linearity resolution
  • adjustable time-to-digital converters
  • LiDAR applications

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