SHI Xiao-feng,PANG Xue,ZHU Li-jun,et al.Development of photoelectric integrated single photon avalanche photodiode and front-end circuit based on BCD technology[J].Optics and Precision Engineering,2021,29(02):267-277.
SHI Xiao-feng,PANG Xue,ZHU Li-jun,et al.Development of photoelectric integrated single photon avalanche photodiode and front-end circuit based on BCD technology[J].Optics and Precision Engineering,2021,29(02):267-277.DOI: 10.37188/OPE.20212902.0267.
Development of photoelectric integrated single photon avalanche photodiode and front-end circuit based on BCD technology
A type of single-photon avalanche photodiode (SPAD) and front-end quench reset circuit (QRC), based on bipolar-CMOS-DMOS (BCD) technology, for detecting weak optical signals was proposed in this study. To reduce the risk of edge breakdown and to improve the responsivity, a circular SPAD with a P+/Nwell/deep-Nwell (DNwell) structure was designed. The pn junction formed between the DNwell and substrate could effectively reduce the dark current flowing from the P substrate to the avalanche region. It could also reduce the dark count rate, ensure a small longitudinal transit time, and improve the response speed. Simultaneously, a Pwell protection ring was designed to increase the breakdown voltage of the device. A two-dimensional simulation of the device was conducted using SILVACO, and the proposed structure was then compared with the traditional P+/Nwell and P+/Nwell/DNwell structures. The advantages of the design structure in terms of breakdown voltage and responsivity were verified. To realize a cooperative design of photodetectors and integrated circuits, the equivalent circuit model of avalanche photodiode optoelectronic devices was improved. Accordingly, an active quenching reset circuit was designed. The dead time is determined to be approximately 2.6 ns, which can achieve the purpose of rapid detection. Results show that the avalanche breakdown voltage of the P+/Nwell/DNwell structure is 15.8 V. When the excess bias voltage is 0.2 V, the responsivity is approximately 0.80 A/W, and the dark count rate is 20 kHz.
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