Patent ID: 8841740

Claim:
A single-photon avalanche diode assembly, comprising: a diode comprising a central terminal and a peripheral terminal wherein: the peripheral terminal is connected to an input of a comparator and to a first power supply terminal by a first resistor; the central terminal is connected by a conductive track to a second power supply terminal, a second resistor being arranged in series on said conductive track between the central terminal and the second power supply terminal; and the diode is formed in an upper portion of a first conductivity type of a semiconductor substrate, the upper portion comprising: a well of the first conductivity type; a ring of a second conductivity type surrounding the well; and a buried layer of the second conductivity type extending under the well, wherein: the central terminal of the diode comprises a region of the first conductivity type at the center of the well and more heavily doped than the well; and the peripheral terminal of the diode comprises regions of the second conductivity type in the ring and more heavily doped than the ring.