Analytical charge collection and MTF model for photodiode-based CMOS imagers

Chi Shao S. Lin*, Bimal P. Mathur, Mau-Chung Chang

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations


An analytical charge collection model is derived to assess the impact of the photodiode size, doping profile and surface recombination velocity on the modulation transfer function (MTF) and the charge collection efficiency of CMOS imagers. Effects of the microlens and optical isolation are also quantitatively analyzed. The calculated MTF results agree well with measured data of fabricated imagers based on three different pixel designs.

Original languageEnglish
Pages (from-to)754-761
Number of pages8
JournalIEEE Transactions on Electron Devices
Issue number5
StatePublished - 1 May 2002


  • Charge collection
  • CMOS imagers
  • Collection efficiency
  • Modulation transfer function
  • Pixel design
  • Quantum efficiency
  • Spatial resolution

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