Detectors 189
Detectors 189 :
Particle Detectors: (4.25) Single-Photon Avalanche Diode: (1) Operating Principle: (1. 1) Passive Quenching: The simplest quenching circuit is commonly called Passive Quenching Circuit and composed of a single resistor in series to the SPAD. This experimental setup has been employed since the early studies on the avalanche breakdown in junctions. The avalanche current self-quenches simply because it develops a voltage drop across a high-value ballast load RL (about 100 kΩ or more). After the quenching of the avalanche current, the SPAD bias VD slowly recovers to Va, and therefore the detector is ready to be ignited again. A detailed description of the quenching process is reported in
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