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
© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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.
- Avoin saatavuus