Analysis of active pixel sensor readout circuit

Khaled Salama*, Abbas El Gamal

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


This brief provides a detailed analysis of active pixel sensor, pixel and column circuit. Surprisingly, we find that shorter readout times can be achieved by reducing the bias current and hence reducing energy consumption. We investigate the effect of nonidealities on the readout operation. We find that when the follower transistor channel-length modulation is taken into consideration, delay is reduced, which implies that shorter length transistors can be used in the pixel. We show that readout time decreases linearly with technology scaling.

Original languageEnglish (US)
Pages (from-to)941-944
Number of pages4
JournalIEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications
Issue number7
StatePublished - Jul 2003
Externally publishedYes


  • Active pixel sensor (APS)
  • CMOS image sensor
  • High-speed imaging
  • Readout electronics

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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