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(a) Simplified electric structure of a SiPM composed of several G-APDs in series with a quenching resistor. (b) Equivalent circuit of a single cell when the device is on (a bias voltage V bias is applied) and is detecting photons. The capacitor C cell initially charged at V bias discharges through R cell dropping the bias voltage to V breakdown. The avalanche process is quenched via the quenching resistor and then the device is recharged
