Compact CMOS analog readout circuit for photon counting applications

Ekaterina Panina, Lucio Pancheri, Gian Franco Dalla Betta, Leonardo Gasparini, David Stoppa

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Abstract

The design, simulation results and experimental characterization of a compact analog readout circuit for photon counting applications are presented in this paper. Two linear test arrays of 40 pixels with 25 μm pixel pitch have been fabricated in a 0.15 μm CMOS technology. Each pixel of the array consists of a Single-Photon Avalanche Diode (SPAD), a quenching circuit, a time-gating circuit and an analog counter. Each input pulse corresponding to a SPAD avalanche event is converted to a step in the output voltage. Along with compactness, the circuit was designed targeting low power consumption, good output linearity and sub-nanosecond timing resolution. The circuit features 8.6% pixel output nonuniformity and 1.1 % non-linearity. The gating circuit provides the sub-nanosecond window of 0.95 ns at FWHM. Consisting of a small number of transistors and occupying only 238μm2, this approach is suitable for the design of SPAD-based image sensors with high spatial resolution.

Original languageEnglish
Title of host publicationPhoton Counting Applications IV; and Quantum Optics and Quantum Information Transfer and Processing
DOIs
Publication statusPublished - 2013
Externally publishedYes
EventPhoton Counting Applications IV; and Quantum Optics and Quantum Information Transfer and Processing - Prague, Czech Republic
Duration: 16 Apr 201317 Apr 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8773
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhoton Counting Applications IV; and Quantum Optics and Quantum Information Transfer and Processing
CountryCzech Republic
CityPrague
Period16/04/1317/04/13

Keywords

  • Analog circuit
  • CMOS
  • Counter
  • Image sensor
  • Readout
  • SPAD

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