Zhiqiang Ma, Zhong Wu, Yue Xu. Compact SPAD pixels with fast and accurate photon counting in the analog domain[J]. Journal of Semiconductors, 2021, 42(5): 052402
- Journal of Semiconductors
- Vol. 42, Issue 5, 052402 (2021)
Fig. 1. A front-end circuit diagram of SPAD pixel, including a PQARC and an analog counter.
Fig. 2. The timing diagram of pixel signals.
Fig. 3. (Color online) Die micrograph of the compact SPAD pixel.
Fig. 4. (Color online) Transient output avalanche pulse of the proposed quenching and recharging circuit. (a) Tested waveform. (b) Simulated waveform with on-chip buffer. (c) Simulated waveform without buffer.
Fig. 5. (Color online) Readout voltage of the analog counter as a function of the photon-counting number.
Fig. 6. (Color online) Non-linearity characteristics of the analog counter. (a) Differential non-linearity (DNL). (b) Integral non-linearity (INL).
Fig. 7. (Color online) Output voltage step size as a function of (a) pulsewidth and (b) period for the analog counter.
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Table 1. Summary of performance Comparison with SPAD pixels reported in the literature.
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