High precision time-to-digital conversion circuit for mercury cadmium telluride APD detector at 77K
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1.Key Laboratory of Infrared Imaging Materials and Detectors, Shanghai Institute of Technology Physics, Chinese Academy of Sciences,Shanghai 200083, China;2.University of Chinese Academy of Sciences, Beijing 100049, China

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Supported by National Natural Science Foundation of China young Science Foundation(62104240)

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    Abstract:

    HgCdTe avalanche photodiode (APD) is frontier research on infrared focal plane technology, High-precision time stamp"s readout circuit is the basis of the APD focal plane at 77 K, which directly affects APD infrared focal plane performance. Time-to-digital conversion circuit (TDC) is one of the methods to achieve high-precision time stamping. Based on the analysis of MOSFET device at low temperature, we design a vernier TDC circuit, which uses a synchronous counter to quantize an integer multiple of the periods to achieve a coarse count of 6 bits; We use the high-frequency clock multiplied by the on-chip phase-locked loop to quantify the part that is less than one clock cycle to achieve a fine-count of 6 bits output. The circuit adopts standard CMOS process tape out, our circuit works at a master-frequency of 120 MHz. At 77 K, the circuit tests can distinguish the time resolution of 236.280 ps. The DNL is within -0.54~0.71 LSB, and the INL is within -1.32~1.21 LSB.

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ZHANG Qi-Wen, CHEN Hong-Lei, DING Rui-Jun. High precision time-to-digital conversion circuit for mercury cadmium telluride APD detector at 77K[J]. Journal of Infrared and Millimeter Waves,2022,41(1):330~337

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History
  • Received:March 10,2021
  • Revised:January 17,2022
  • Adopted:March 26,2021
  • Online: January 17,2022
  • Published: