Regulated Common-Gate Transimpedance Amplifier Designed to Operate with a Silicon Photo-Multiplier at the Input

Manuel de Medeiros Silva, Luís Augusto Bica Gomes de Oliveira

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37 Citations (Scopus)


A transimpedance amplifier (TIA) in the front-end of a radiation detector is required to convert the current pulse produced by a light-detector to a voltage pulse with amplitude and shape suitable for the subsequent processing. We consider in this paper the specifications of a positron emission tomography (PET) scanner for medical imaging. The conventional approach is to use an avalanche photo-diode (APD) as the light-detector and a feedback TIA. We point out here that, when the APD is replaced by the more recent silicon photomultiplier (SiPM), a feedback TIA is not suitable, and we propose the use of a regulated common-gate (RC-G) TIA. We derive the transimpedance function of the RC-G TIA considering the parasitic capacitances that have a dominant effect on the pulse shaping. We use the result obtained to establish TIA design guidelines, and we show that these should be different with an APD and with a SiPM at the input. We identify the dominant noise source in the RC-G TIA, and we derive a closed form equation for the output noise rms voltage. A prototype TIA was designed for UMC 130 nm CMOS technology. We present simulation and experimental results that confirm that the RC-G circuit is suitable for implementation of the TIAs in the front-end of a PET scanner using SiPMs at the input.
Original languageEnglish
Article number6630131
Pages (from-to)725-735
JournalIEEE Transactions On Circuits And Systems I-Regular Papers
Issue number3
Publication statusPublished - Mar 2014


  • Amplifiers
  • noise analysis
  • positron emission tomography
  • radiation detectors
  • silicon photo-multiplier
  • transimpedance amplifiers


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