A CMOS linear voltage/current dual-mode imager

Yang Zheng, Viktor Gruev, Jan Van Der Spiegel

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present a CMOS image sensor capable of both voltage- and current-mode operations. Each pixel on the imager has a single transistor acting as either source follower for voltage readout, or transconductor for current readout. The two modes share the same readout lines, but have their own correlated double sampling (CDS) units for noise suppression. We also propose a novel current-mode readout technique using a velocity-saturated short-channel transistor, which achieves high linearity. The 300×200 image array is a mixture of 3 types of pixels with identical photodiodes and access switches; while the readout transistors are sized for their designated mode of operation. This ensures a fair comparison on the performance of the different modes.

Original languageEnglish (US)
Title of host publicationISCAS 2006
Subtitle of host publication2006 IEEE International Symposium on Circuits and Systems, Proceedings
Number of pages4
StatePublished - 2006
Externally publishedYes
EventISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems - Kos, Greece
Duration: May 21 2006May 24 2006

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
ISSN (Print)0271-4310


OtherISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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