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Active and Passive Electronic Components
Volume 2012 (2012), Article ID 610176, 6 pages
http://dx.doi.org/10.1155/2012/610176
Research Article

Adaptive Gain and Analog Wavelet Transform for Low-Power Infrared Image Sensors

1CEA LETI, MINATEC Campus, 38054 Grenoble, France
2TIMA Laboratory, 38031 Grenoble, France
3SOFRADIR, 38113 Veurey-Voroize, France

Received 29 September 2011; Revised 31 January 2012; Accepted 8 February 2012

Academic Editor: Gianluca Traversi

Copyright © 2012 P. Villard et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A decorrelation and analog-to-digital conversion scheme aiming to reduce the power consumption of infrared image sensors is presented in this paper. To exploit both intraframe redundancy and inherent photon shot noise characteristics, a column based 1D Haar analog wavelet transform combined with variable gain amplification prior to A/D conversion is used. This allows to use only an 11-bit ADC, instead of a 13-bit one, and to save 15% of data transfer. An 8 × 1 6 pixels test circuit demonstrates this functionality.