Affiliation of Author(s):[1]Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China;[2]Southwest Inst Tech Phys, Chengdu 610000, Peoples R China
Journal:SEVENTH SYMPOSIUM ON NOVEL PHOTOELECTRONIC DETECTION TECHNOLOGY AND APPLICATIONS
Key Words:LiDAR; Geiger Mode APD; 3D Imaging; TDC; Multi-Echo Detection
Abstract:Single photon flash light detection and ranging (LiDAR), which is based on Geiger Mode avalanche photodiode (GM-APD) array, enables superior sensitivity and detection range to obtaining depth information. The Flash LiDAR captures an entire 3D image by single laser pulse, much faster than conventional LiDAR based on the scanning of a single detector over the scene. In conventional advanced driver assistant systems (ADAS), closer and weaker reflections caused by the environmental factors will cause misidentification. Furthermore, power dissipation and limited pixel size are enormous challenges for Readout Integrated Circuit (ROIC) design. The paper proposes the design of ROIC with Multi-Echo Detection for 128x32 GM-APD Array. The pixel includes active quenching and reset circuit of GM-APD, and embedded 11-bit Time to Digital Converter (TDC) offers precise distance resolution by Time of Flight (TOF) measurement. The proposed ROIC is designed with 0.18 mu m CMOS process. Due to shared DFFs by TDC and shift register, 90 mu m pixel pitch is realized with Multi-Echo Detection function. Global clock gating(GCG) and shift clock gating(SCG) techniques bring the power dissipation down to 464.6mW.
Document Type:Proceedings Paper
Volume:11763
ISSN No.:0277-786X
Translation or Not:no