Logarithmic Photoreceptor Incorporating Lateral Bipolar Transistors For Improved Matching And Dynamic Range
Abstract
Offsets and limited dynamic range in the photo-conversion elements of silicon VLSI vision systems limit the overall system performance in low-contrast environments. This paper will introduce a new continuous-time, logarithmic photoreceptor which exhibits an improvement in the signal-to-offset ratio at low and medium intensities of 31% and 137% respectively. In addition, the logarithmic receptor exhibits a larger dynamic range than previous continuous-time receptors. Measured performance characteristics will be shown which quantify these improvements. We further show both analytically and through measured results that the offsets decrease as current levels increase.
Recommended Citation
M. D. Rowley et al., "Logarithmic Photoreceptor Incorporating Lateral Bipolar Transistors For Improved Matching And Dynamic Range," Proceedings IEEE International Symposium on Circuits and Systems, vol. 3, pp. 1852 - 1855, Institute of Electrical and Electronics Engineers, Jan 1997.
Department(s)
Electrical and Computer Engineering
International Standard Serial Number (ISSN)
0271-4310
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Jan 1997
