Prototype ROIC with differential pixel readout for uncooled IR detector arrays

Sang Joon Hwang, Seung Woo Ryu, Ho Hyun Shin, Man Young Sung

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


As infrared light is radiated, the CMOS Readout IC (ROIC) for the microbolometer type infrared sensor detects voltage or current when the resistance value in the bolometer sensor varies. One of the serious problems in designing the ROIC is that resistances in the bolometer and replica resistor have process variation. This means that each pixel does not have the same resistance, causing serious fixed pattern noise problems in sensor operations, In this paper, differential input stage readout architecture is suggested for bias offset reduction, noise immunity and high sensing margin. In addition, using this scheme the effects of a process variation problem and various other bias heating noise problems, are reduced. In this paper, a prototype ROICs, intended for uncooled microbolometer infrared focal plane array, is designed and fabricated. The proposed architecture is demonstrated by fabrication of a prototype consisting of 32 × 32 pixels fabricated in a 0.25-μm CMOS process.

Original languageEnglish
Title of host publicationSmart Structures, Devices, and Systems III
Publication statusPublished - 2007
EventSmart Structures, Devices, and Systems III - Adelaide, Australia
Duration: 2006 Dec 112006 Dec 13

Publication series

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


OtherSmart Structures, Devices, and Systems III


  • Facal plane array
  • Fixed pattern noise
  • ROIC
  • Uncooled microbolometer

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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