Cart (Loading....) | Create Account
Close category search window

A low-photocurrent CMOS retinal focal-plane sensor with pseudo-BJT smoothing network and adaptive current Schmitt trigger for scanner applications

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Wu, C.-Y. ; Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsing Chu, Taiwan ; Cheng-Ta Chiang

In this paper, a new structure of low-photocurrent CMOS retinal focal-plane sensor with pseudo-BJT smoothing network and adaptive current Schmitt trigger is proposed. The proposed structure is very simple and compact. This new circuit can be easily implemented in CMOS technology with a small chip area. Besides, another innovation of this circuit is that the proposed circuit could be operated for low-induced current level (pA), and the current hysteresis of proposed current Schmitt trigger could be adjusted adaptively according to the value of induced photocurrent. In this paper, the detection of static and moving objects, such as a moving white bar, are proven by projecting a pattern through HSPICE simulation. The proposed retinal focal-plane sensor includes 32 × 32 pixel array with a pixel size of 70 × 70 μm2. The fill factor is 75% and the total chip area is 3000 × 3030 μm2. It is with fully functional 32 × 32 implementations consuming less than 8.8 μW per pixel at 3.3 V. Measurement results present the proposed retinal focal-plane sensor could be successfully used in character recognition, such as pen-scanner or etc.

Published in:

Sensors, 2003. Proceedings of IEEE  (Volume:2 )

Date of Conference:

22-24 Oct. 2003

Need Help?

IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.