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Proceedings Paper

CMOS photodetection system with variable-time synchronous detection
Author(s): Patrick Pittet; Guo Neng Lu; Michel Pitaval; Laurent Quiquerez
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Paper Abstract

For sensitive fluorescence detection requiring weak signal recovery, we propose a novel digital synchronous detection method. It is based on a voltage/time duality concept which, compared to a conventional approach, consists of transformation of constant sampling rate with voltage measurement into variable-time sampling with constant threshold voltage. This Variable-Time Synchronous Detection (VTSD) method ensures a constant SNR over a large dynamic range, with optimised measuring rate. It can be implemented without any precise analogue-to-digital converter. A CMOS photodetection system with implementation of this VTSD method together with charge amplification is designed and tested. The results confirm its ability to recover photocurrent signals at femto-Ampers levels.

Paper Details

Date Published: 19 February 2004
PDF: 10 pages
Proc. SPIE 5251, Detectors and Associated Signal Processing, (19 February 2004); doi: 10.1117/12.512487
Show Author Affiliations
Patrick Pittet, Univ. Claude Bernard Lyon I (France)
Guo Neng Lu, Univ. Claude Bernard Lyon I (France)
Michel Pitaval, Univ. Claude Bernard Lyon I (France)
Laurent Quiquerez, Univ. Claude Bernard Lyon I (France)

Published in SPIE Proceedings Vol. 5251:
Detectors and Associated Signal Processing
Jean-Pierre Chatard; Peter N. J. Dennis, Editor(s)

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