A 3-dimensional modified vernier time-to-digital converter for lidar sensors

Ying He, Ji Eun Joo, Sung Min Park

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This paper presents a three-dimensional (3-D) modified Vernier time-to-digital converter (MV-TDC) for the applications of light detection and ranging (LiDAR) sensors. The proposed 3-D MV-TDC combines a 2-D modified Vernier TDC and a delay-lock loop (DLL) that is preceded by an XOR and an edge-detector as its input circuitry, so that the former provides 4-bit coarse digital codes while the latter generates 4-bit fine codes during the high-state of DLL that is maintained only between each rising edge of START and STOP pulses. Then, the measured detection range of a LiDAR sensor can be represented by an 8-bit digital code. The proposed 3-D MV-TDC were implemented in a 0.13-μm CMOS process, demonstrating the measured dynamic range of 43.2 dB that corresponds to the detection range of 18.8 centimeters~28.6 meters. The chip dissipates 2.9 mW from a single 1.2-V supply, while its core occupies the area of 0.37 x 0.89 mm2.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Semiconductor Technology and Science
Issue number6
StatePublished - Dec 2020


  • DLL
  • Edge-detector
  • LiDAR sensor
  • T-latch
  • Vernier TDC


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