| US 7,616,062 B2 | ||
| Received-light amplifier | ||
| Shinichi Miyamoto, Kyoto (Japan); and Hideo Fukuda, Kyoto (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Oct. 26, 2007, as Appl. No. 11/924,725. | ||
| Claims priority of application No. 2006-298912 (JP), filed on Nov. 02, 2006. | ||
| Prior Publication US 2008/0106338 A1, May 08, 2008 | ||
| Int. Cl. H03F 3/08 (2006.01) | ||
| U.S. Cl. 330—308 [250/214 A] | 8 Claims |
| 1. A received-light amplifier comprising:
a light-receiving device;
a current amplification circuit which amplifies an output current from said light-receiving device, and outputs the amplified
current; and
a current-voltage conversion circuit which performs voltage-conversion on the output current from said current amplification
circuit,
wherein said current amplification circuit includes:
a first operational amplifier;
a first feedback resistor connected between an inverting input terminal and an output terminal of said first operational amplifier;
a second feedback resistor connected in parallel to said first feedback resistor;
a third feedback resistor connected between a non-inverting input terminal and the output terminal of said first operational
amplifier; and
a first switch inserted between said second feedback resistor and one of the output terminal and the inverting input terminal
of said first operational amplifier.
|