Patent ID: 8941413
Filing Date: 2015-01-27
Classification: H03K

Abstract:
1. A light receiving circuit, comprising: a photoelectric conversion element connected to a node and to a GND terminal and that causes a current corresponding to an amount of incident light to flow to the node; a voltage detection circuit connected to a power supply and to the GND terminal that outputs a detection signal in response to a voltage of the node that is equal to or higher than a first voltage; a reset circuit that receives the detection signal and having a reset terminal connected between the photoelectric conversion element and the node and that causes the current of the photoelectric conversion element to flow to the GND terminal, such that the voltage of the node changes to a second voltage, which is lower than the first voltage, and holds this state when the detection signal is no longer received; and a voltage increase detection circuit that detects a fluctuation in the voltage of the node and outputs a detection result.