| 摘要 |
A photodiode receives an infrared signal transmitted from a transmitter. A current distributing unit outputs a detection current Id output from the photodiode as a first detection current Id1 and a second detection current Id2 to a subsequent first current-to-voltage conversion amplifier and a subsequent second current-to-voltage conversion amplifier respectively. The first and second current-to-voltage conversion amplifiers convert the detection currents into voltages with current-to-voltage conversion gains g1 and g2. The current-to-voltage conversion gains g1 and g2 of the first and second current-to-voltage conversion amplifiers are set such that ranges of signal levels in which the distributed detection currents Id1 and Id2 can significantly be amplified differ from each other.
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