An Integrated 200MHz 4A Pulsed Laser Driver with DLL-Based Time Interpolator for Indirect Time-of-Flight Applications
- Resource Type
- Conference
- Authors
- Zhuo, Shenglong; Wang, Yuwei; Xia, Tao; Wu, Yifan; Xie, Lichun; Zheng, Wei; Lin, Zhihong; Sun, Miao; Zhao, Lei; Qin, Yajie; Bai, Rui; Chiang, Patrick Yin
- Source
- 2022 IEEE International Symposium on Circuits and Systems (ISCAS) Circuits and Systems (ISCAS), 2022 IEEE International Symposium on. :3493-3497 May, 2022
- Subject
- Components, Circuits, Devices and Systems
Power, Energy and Industry Applications
Robotics and Control Systems
Signal Processing and Analysis
Frequency modulation
Power lasers
Power control
Measurement by laser beam
Calibration
Laser tuning
Optical modulation
Time of Flight
Laser Driver
Time Interpolator
Delay Locked Loop
- Language
- ISSN
- 2158-1525
This paper presents an integrated pulsed laser driver in 180nm BCD process for indirect time-of-flight applications. Pulses with 4A peak current at a modulation frequency up to 200MHz can be generated. Automatic optical power control (AOPC) is realized for laser eye safety protection. A DLL-based time interpolator is proposed to eliminate the mechanical moving components used during system calibration. The measured absolute accuracy of the time interpolator is +/−50ps with a resolution of 800ps and tuning range of 49. 6ns. This work effectively extends the measurement distance of the I-ToF system. The calibration efficiency is also improved with the proposed method.