Patent ID: 8138464

Claim:
An optical-receiving circuit comprising: a first photodiode converting an optical signal into a current signal; a first trans-impedance amplifier to which a first power supply voltage of V reg is supplied and which has a negative feedback resistor and to which the current signal is input and which outputs a voltage signal; and an output circuit to which the voltage signal output from the first trans-impedance amplifier is input and which outputs a voltage signal to the outside, the output circuit having an output transistor, a temperature coefficient of a voltage of (V reg −MV be ) being positive, in which V be is a base-emitter voltage of a transistor contained in the first trans-impedance amplifier and M is a coefficient that does not depend on the temperature, a second power supply voltage being supplied to a collector of the output transistor through N (where, N≧1) diodes that are serially connected, and a temperature coefficient of the second power supply voltage being about N times of a temperature coefficient of the diodes.