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Most active quench circuits used for single-photon avalanche detectors aredesigned either with discrete components which lack the flexibility ofdynamically changing the control parameters, or with custom ASICs which requirea long development time and high cost. As an alternative, we present areconfigurable and robust hybrid design implemented using a System-on-Chip(SoC), which integrates both an FPGA and a microcontroller. We take advantageof the FPGA's speed and configuration capabilities to vary the quench and resetparameters dynamically over a large range, thus allowing our circuit to operatewith a wide variety of APDs without having to re-design the system. Themicrocontroller enables the remote adjustment of control parameters andre-calibration of APDs in the field. The ruggedized design uses components withspace heritage, thus making it suitable for space-based applications in thefields of telecommunications and quantum key distribution (QKD). Wecharacterize our circuit with a commercial APD cooled to 253K, and obtain adeadtime of 35ns while maintaining the after-pulsing probability at close to3%. We also demonstrate versatility of the circuit by directly testing customfabricated chip-scale APDs, which paves the way for automated wafer-scaletesting and characterization.

Realizing a robust, reconfigurable active quenching design for multiple architectures of single-photon avalanche detectors