Light receiving device

A light receiving device that receives a light signal, the light receiving device comprising:

• a plurality of avalanche photodiodes, in each of which receiving sensitivity is set in accordance with a bias signal provided;
• a plurality of level conversion units provided in association with the avalanche photodiodes, each of the level conversion units
• being configured to convert a level of a reference voltage for obtaining the bias signal so as to generate the bias signal and
• being configured to provide the bias signal to a corresponding one of the avalanche photodiodes;
• and
• a control unit
• to generate a first control signal corresponding to a temperature of the light receiving device, and
• to control a level conversion amount of each of the level conversion units by using the first control signal;
• and
• a booster unit
• to boost a power supply voltage so as to generate the reference voltage, and
• to provide the reference voltage to the level conversion units, wherein
• each of the level conversion units converts the level of the reference voltage on the basis of the first control signal so as to generate the bias signal,
• the booster unit generates the reference voltage by adding a voltage value determined on the basis of a voltage between an output terminal and a control terminal of a transistor used in the level conversion unit to a voltage that is the largest of the bias signals for the avalanche photodiodes, and
• the control unit generates a second control signal corresponding to the temperature of the light receiving device and controls the reference voltage generated by the booster unit by using the second control signal.