A statistical evaluation of effective time constants of random telegraph noise with various operation timings of in-pixel source follower transistors

A. Yonezawa, R. Kuroda, A. Teramoto, T. Obara, S. Sugawa

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

2 Citations (Scopus)

Abstract

We evaluated effective time constants of random telegraph noise (RTN) with various operation timings of in-pixel source follower transistors statistically, and discuss the dependency of RTN time constants on the duty ratio (on/off ratio) of MOSFET which is controlled by the gate to source voltage (VGS). Under a general readout operation of CMOS image sensor (CIS), the row selected pixel-source followers (SFs) turn on and not selected pixel-SFs operate at different bias conditions depending on the select switch position; when select switch locate in between the SF driver and column output line, SF drivers nearly turn off. The duty ratio and cyclic period of selected time of SF driver depends on the operation timing determined by the column read out sequence. By changing the duty ratio from 1 to 7.6 × 10-3, time constant ratio of RTN (time to capture 〈(τc〉)/(time to emission τe〉) of a part of MOSFETs increased while RTN amplitudes were almost the same regardless of the duty ratio. In these MOSFETs, 〈τc〉 increased and the majority of 〈τ e〉 decreased and the minority of 〈τe〉 increased by decreasing the duty ratio. The same tendencies of behaviors of 〈τc〉 and 〈τe〉 were obtained when VGS was decreased. This indicates that the effective 〈τc〉 and 〈τe〉 converge to those under off state as duty ratio decreases. These results are important for the noise reduction, detection and analysis of in pixel-SF with RTN.

Original languageEnglish
Title of host publicationProceedings of SPIE-IS and T Electronic Imaging - Image Sensors and Imaging Systems 2014
PublisherSPIE
ISBN (Print)9780819499394
DOIs
Publication statusPublished - 2014 Jan 1
EventImage Sensors and Imaging Systems 2014 - San Francisco, CA, United States
Duration: 2014 Feb 52014 Feb 6

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9022
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherImage Sensors and Imaging Systems 2014
CountryUnited States
CitySan Francisco, CA
Period14/2/514/2/6

Keywords

  • CMOS Image sensor
  • MOSFET
  • andom telegraph noise (RTN)
  • cyclic operation
  • time constant

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Yonezawa, A., Kuroda, R., Teramoto, A., Obara, T., & Sugawa, S. (2014). A statistical evaluation of effective time constants of random telegraph noise with various operation timings of in-pixel source follower transistors. In Proceedings of SPIE-IS and T Electronic Imaging - Image Sensors and Imaging Systems 2014 [90220F] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9022). SPIE. https://doi.org/10.1117/12.2041090