Analysis of gated CMOS image sensor for spatial filtering

Arthur Spivak, Alexander Belenky, Alexander Fish, Orly Yadid-Pecht

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Pulsed gated vision systems are essential tools in obtaining images in obscure environmental conditions. Contrary to the existing gated systems, which use intensifiers and other external equipment, we present a design of gated sensor, which is implemented in a CMOS process. The proposed sensor is capable to filter out the objects according to their distance to the camera. This ability enables to remove the undesired reflections and to see more clearly the target. Such gated vision principle is implemented using a unique multishuttering regime. Various properties of this regime such as charge-transfer mechanisms, frequency of switching, pulsewidth, slew rate, etc., are described and thoroughly analyzed. Upon the performed analysis, we optimize the shape of the shutter pulses and substantially reduce the charge-transfer time. A 128 × 256 CMOS gated image sensor was fabricated in 0.18-μm process and successfully tested. The included experimental results fully corroborate with the theory, showing the sensor functionality and proving the feasibility of the proposed design.

Original languageEnglish
Article number6365291
Pages (from-to)305-313
Number of pages9
JournalIEEE Transactions on Electron Devices
Volume60
Issue number1
DOIs
StatePublished - 1 Jan 2013
Externally publishedYes

Keywords

  • Active-pixel sensor
  • CMOS image sensors
  • charge transfer
  • gating
  • global shutter
  • sensor

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