Quenching bias circuit with current mirror for single photon detection

Himchan Park; Kyunghoon Kim; Changzhi Yu; Eugene Chong; Jinwook Burm; Byeonghwang Park

doi:10.1587/elex.16.20190657

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Quenching bias circuit with current mirror for single photon detection

Himchan Park, Kyunghoon Kim, Changzhi Yu, Eugene Chong, Jinwook Burm, Byeonghwang Park

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Keywords: SPAD (Single Photo Avalanche Diode), current mirror, quenching, fill factor, operation voltage

JOURNAL FREE ACCESS

2019 Volume 16 Issue 23 Pages 20190657

DOI https://doi.org/10.1587/elex.16.20190657

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Abstract

To minimize the characteristic variation of SPADs (Single-Photon Avalanche Photo Diodes) with bias, a current mirror based quenching bias circuit is implemented and tested for Single Photon Detection. With the proposed quenching bias circuit, the operational bias variation of SPADs is successfully reduced. A SPAD and quenching bias circuit are integrated in a 43 µm × 43 µm area to make a micro pixel. The optimized bias circuit maximizes the photon detection area to have more than 50% fill factor. This paper is based on a 0.18 µm standard CMOS process with thick gate oxide option.

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