The 15th IEEE International Conference on Electron Devices and Solid-State Circuits (EDSSC)

458 / 2019-02-27 19:45:40

A Compact TOF Measurement Circuit with Photon Counting and Timing

Time-of-flight (TOF), Compactness, Analog counter, Time-to-amplitude converter (TAC)

Plenary track > Analog Circuits

This paper presents a compact photon flight time measurement circuit which collects photon information in two modes: the direct time-of-flight (D-TOF) and the indirect time-of-flight (I-TOF). In order to reduce the circuit dimension, only 16 MOSFETs and a small integral capacitor of 100fF is adopted. This circuit design is characterized by low static power dissipa-tion of 20.4μW and good linearity. The differential nonlinearity (DNL) of 0.45LSB in the D-TOF mode with the measurement range of 100ns is achieved. Moreover, the DNL of 0.4LSB in the 8-bit count range in the I-TOF mode is observed. The pro-posed TOF measurement circuit is good for high-density im-aging array integration due to the small dimension and good performance.