Title :
An Asynchronous Projection and Summation Circuit for In-Pixel Processing in Single Photon Avalanche Diode Sensors
Author :
Xiao Yang ; Hongbo Zhu ; Nakura, Toru ; Iizuka, Tetsuya ; Asada, Kunihiro
Author_Institution :
Dept. of Electr. Eng. & Inf. Syst., Univ. of Tokyo, Tokyo, Japan
Abstract :
An asynchronous projection and summation circuit is proposed for single photon avalanche diode (SPAD) sensors. Thanks to the efficient interconnection by the asynchronous technique, the circuit can be easily implemented inside 2D SPAD arrays. As a result, the precise summation of the 1b data in one row can be parallel processed for all rows within the same cycle. A test-of-concept chip was fabricated in a 1P5M 0.18 μm CMOS process. By measurement results, the summation of a 15-pixel row can be achieved by the proposed circuit within 22 ns. Such a speed is very important for SPAD-based sensors that need fast summation operations.
Keywords :
CMOS integrated circuits; asynchronous circuits; avalanche diodes; integrated circuit testing; sensor arrays; summing circuits; 1P5M CMOS process; 2D SPAD array; asynchronous projection circuit; complementary metal oxide semiconductor; in-pixel processing; parallel processing; single photon avalanche diode sensor; size 0.18 mum; summation circuit; test-of-concept chip; Adders; Array signal processing; Electric breakdown; Integrated circuit interconnections; Logic gates; Noise; Sensors; Asynchronous circuits; Full pixels parallel processing;
Conference_Titel :
Design and Diagnostics of Electronic Circuits & Systems (DDECS), 2015 IEEE 18th International Symposium on
Conference_Location :
Belgrade
Print_ISBN :
978-1-4799-6779-7
DOI :
10.1109/DDECS.2015.14
