Are wave union methods still suitable for 20 nm FPGA-based high-resolution (< 2 ps) time-to-digital converters?

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Xie, Wujun and Chen, Haochang and Li, David Day-Uei (2020) Are wave union methods still suitable for 20 nm FPGA-based high-resolution (< 2 ps) time-to-digital converters? Preprint / Working Paper. arXiv.org, Ithaca, New York.

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Abstract

This paper presents several new structures to pursue high-resolution (< 2 ps) time-to-digital converters (TDCs) in Xilinx 20 nm UltraScale field-programmable gate arrays (FPGAs). The proposed TDCs combined the advantages of 1) our newly proposed sub-tapped delay line (sub-TDL) architecture that is effective in removing bubbles and zero-bins and 2) the wave union (WU) A method to improve the resolution and reduce the impact introduced from ultrawide bins. We also compared the proposed WU/sub-TDL TDC with the TDC combining the dual sampling (DS) structure and the sub-TDL technique. Moreover, a binning method was introduced to improve the linearity. A formula of the total measurement uncertainty for a single-stage TDL-TDC has also been derived to obtain its root-mean-square (RMS) resolution. Results conclude that the proposed designs are cost-effective in logic resources and have the potential for multiple-channel implementations. Different from the conclusions from a previous study, we found that the wave union is still powerful in UltraScale devices when combining with our sub-TDL structure. We also compared with other published TDCs to demonstrate where the proposed TDCs stand.

ORCID iDs

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;
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