On the time gating of SPADs in a synchronized time-gated SPAD array in Raman spectroscopy
Nissinen, Ilkka; Nissinen, Jan; Kostamovaara, Juha (2017-12-25)
I. Nissinen, J. Nissinen and J. Kostamovaara, "On the time gating of SPADs in a synchronized time-gated SPAD array in Raman spectroscopy," 2017 IEEE SENSORS, Glasgow, United Kingdom, 2017, pp. 1-3. doi: 10.1109/ICSENS.2017.8234102
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https://urn.fi/URN:NBN:fi-fe201801172102
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Abstract
The effect of the timing of the biasing of a single photon avalanche diode (SPAD) on the accuracy of a time-gated SPAD array has been studied in this work. The measurement was realized in a time-gated Raman spectrometer utilizing a 16×256 CMOS SPAD array with on-chip time gating electronics. SPADs have to be biased into the Geiger-mode just before arriving Raman scattered photons from the sample to achieve synchronous measurements with a pulsed laser, and to minimize the dark count noise. The practical realization is, however, not straight-forward due to the strict timing requirements (∼50ps). With the shown biasing arrangement high timing accuracy and low noise can be achieved without sacrificing the fill factor of the detector array.
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