Photoelectric conversion device and photoelectric conversion system including photoelectric conversion device

A photoelectric conversion device comprising:

• a photoelectric conversion element configured to generate a photon detection signal by avalanche multiplication;
• a resistor element provided between a first terminal of the photoelectric conversion element and a power-supply voltage;
• a counter circuit connected to an output node of the photoelectric conversion element;
• a waveform shaping circuit disposed between the photoelectric conversion element and the counter circuit;
• and
• a gating circuit disposed between an output node of the waveform shaping circuit and an input node of the counter circuit and configured to control whether or not to input an output signal of the waveform shaping circuit to the counter circuit, wherein
• during one standby state, there are a first period in which an output signal of the waveform shaping circuit is counted and a second period in which the gating circuit is controlled so as not to count an output signal of the waveform shaping circuit;
• and
• the photoelectric conversion device comprises a circuit configured to count a number of the first periods in which the output signal of the waveform shaping circuit has been counted.