| 摘要 |
A light-receiving circuit includes a photodiode that converts an input optical signal to a current signal; a current-voltage converting circuit that outputs an output voltage signal obtained by adding a reference voltage to a voltage signal proportional to the current value of the current signal; and an input current limiting unit that supplies the current-voltage converting circuit with the current signal upon limiting the current value of this current signal based upon the reference voltage in such a manner that the output voltage signal will not exceed a constant value irrespective of the value of the reference voltage. |
