Patent ID: 7081609

Claim:
A light-receiving circuit capable of compensating a temperature dependence of a light-receiving device, comprising: a bias supply circuit having an input and an output, said output outputting a bias voltage to said light-receiving device; a voltage divider having a division ratio, said voltage divider receiving said bias voltage output from said bias supply circuit, dividing said bias voltage based on said division ratio and feeding back said divided bias voltage to said input of said bias supply circuit; and a temperature compensation circuit including a differential amplifier having an inverting input, a non-inverting input and an output, a coupling resistor for coupling said output of said differential amplifier to said input of said bias supply circuit, and a temperature-sensing resistor connected between said inverting input and said output of said differential amplifier, said differential amplifier operating in an inverting mode to adjust said division ratio of said voltage divider as a linear function to temperatures so as to compensate said temperature dependence of said light-receiving device, wherein said temperature-sensing resistor senses a temperature of said light-receiving device.