A high-precision and 10 bit two-step Time-to-Digital Converter for TOF application  

作　　者：YE Xuefeng TANG Lizhen WANG Yang JIN Xiangliang PENG Yan LUO Jun 

机构地区：[1]School of Physics and Optoelectronics,Xiangtan University,Xiangtan Hunan 411105,China [2]College of Physics and Electronic Science,Hunan Normal University,Changsha Hunan 410081,China [3]School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China

出　　处：《太赫兹科学与电子信息学报》2021年第3期528-536,共9页Journal of Terahertz Science and Electronic Information Technology

基　　金：National Natural Science Foundation of China(61774129,61827812,61704145);Hunan Science and Technology Department Huxiang High-level Talent Gathering Project(2019RS1037);Changsha Science and Technology Plan Key Projects(kq1801035)。

摘　　要：A two-step high-precision Time-to-Digital Converter(TDC),integrated with a Single-Photon Avalanche Diode(SPAD),used for Time-Of-Flight(TOF)application,has been developed and tested.Time interval measurement is performed by the coarse counter and fine interpolator,which are utilized to measure the total periods and the residue time of the reference clock,respectively.Following a detail analysis of time precision and clock jitter in the two-step structure,the prototype TDC fabricated in GSMC 1P6M 0.18μm CMOS Image Sensor(CIS)technology exhibits a Single-Shot Precision(SSP)of 11.415 ps and a dynamic range of 216.7 ns.In addition,a pixel of the chip occupies 100μm×100μm,and the measured Integral Nonlinearity(INL)and Differential Nonlinearity(DNL)are better than±0.88 LSB and±0.67 LSB,respectively.Meanwhile,the overall power consumption of the chip is 35 mW at 1.8 V power supply.Combined with these characteristics,the designed chip is suitable for TOF-based ranging applications.

关 键 词：Time-to-Digital Converter Single-Shot Precision non-linearity TIME-OF-FLIGHT coarse counter fine interpolator 

分 类 号：TN492[电子电信—微电子学与固体电子学]