Detectors 190
Detectors 190 : Particle Detectors: (4.25) Single-Photon Avalanche Diode: (1) Operating Principle: (1. 2) Active Quenching: A more advanced quenching scheme is called active quenching. In this case a fast discriminator senses the steep onset of the avalanche current across a 50 ? resistor and provides a digital (CMOS, TTL,ECL, NIM) output pulse, synchronous with the photon arrival time. It then quickly reduces the bias voltage to below breakdown, then relatively quickly returns bias to above the breakdown voltage ready to sense the next photon
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