Compact quenching detection circuit applied to array type single-photon avalanche diode (SPAD)

The invention discloses a compact quenching detection circuit applied to an array type single-photon avalanche diode (SPAD). The compact quenching detection circuit comprises a detection circuit, a gated circuit, a quenching circuit and a pulse width adjustable reset circuit. The quenching circuit carries out I-Q-V integration conversion to convert currents into voltage signals by use of avalanche currents generated by an SPAD junction capacitor for the SPAD, pulse signals are output after processing through a single-tube comparator, the pulse signals are shaped through an inverter, and thus a driving capability is enhanced. According to the invention, on one hand, the layout area and circuit transient power consumption can be effectively reduced, and the requirement of the array type SPAD for a power supply source is reduced; on the other hand, the quenching time can be shortened, the detection speed is accelerated, and the non-ideal effects are reduced; and at the same time, a monostable circuit is realized by use of a mode of an external capacitor, and the reset pulse width time can be flexibly adjusted for performance different detectors.