Light-receving circuit and semiconductor device having same
AssigneeNEC Electronics Corporation
InventorHitoshi Imai
Life of this patent
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Abstract
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.
Claims10
A light-receiving circuit comprising:
- a light-receiving element 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 said 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.
Dependencies are inferred from the claim text.