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Sensors 2011, 11(2), 2056-2076; doi:10.3390/s110202056

Design and Implementation of A CMOS Light Pulse Receiver Cell Array for Spatial Optical Communications

1
Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Nakaku, Hamamatsu, Shizuoka 432-8011, Japan
2
Toyota Central R&D Labs., Inc. 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan
*
Author to whom correspondence should be addressed.
Received: 4 January 2011 / Accepted: 6 February 2011 / Published: 10 February 2011
(This article belongs to the Section Physical Sensors)

Abstract

A CMOS light pulse receiver (LPR) cell for spatial optical communications is designed and evaluated by device simulations and a prototype chip implementation. The LPR cell consists of a pinned photodiode and four transistors. It works under sub-threshold region of a MOS transistor and the source terminal voltage which responds to the logarithm of the photo current are read out with a source follower circuit. For finding the position of the light spot on the focal plane, an image pixel array is embedded on the same plane of the LPR cell array. A prototype chip with 640 × 240 image pixels and 640 × 240 LPR cells is implemented with 0.18 μm CMOS technology. A proposed model of the transient response of the LPR cell agrees with the result of the device simulations and measurements. Both imaging at 60 fps and optical communication at the carrier frequency of 1 MHz are successfully performed. The measured signal amplitude and the calculation results of photocurrents show that the spatial optical communication up to 100 m is feasible using a 10 × 10 LED array. View Full-Text
Keywords: spatial optical communication; CMOS image sensor; LED; light pulse receiver spatial optical communication; CMOS image sensor; LED; light pulse receiver
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Zaman Sarker, M.S.; Itoh, S.; Hamai, M.; Takai, I.; Andoh, M.; Yasutomi, K.; Kawahito, S. Design and Implementation of A CMOS Light Pulse Receiver Cell Array for Spatial Optical Communications. Sensors 2011, 11, 2056-2076.

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