Amplifiers – With semiconductor amplifying device – Including atomic particle or radiant energy impinging on a...
Reexamination Certificate
2007-10-26
2009-11-10
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including atomic particle or radiant energy impinging on a...
C250S2140AG
Reexamination Certificate
active
07616062
ABSTRACT:
The present invention has as an object to provide, for received-light amplifiers capable of changing the current-voltage conversion efficiency by changing the resistance of feedback resistors, a received-light amplifier which can prevent the deterioration of output voltage linearity occurring when the current-voltage conversion efficiency is low. The present invention includes: a light-receiving device PD; a current amplification circuit which amplifies an output current of the light-receiving device PD, and outputs the amplified current; and a current-voltage conversion circuit which performs voltage-conversion on the output current from the current amplification circuit. The current amplification circuit includes: an operational amplifier; a feedback resistor Rgn1connected between an inverting input terminal and an output terminal of the operational amplifier; a feedback resistor Rgn2connected in parallel to the feedback resistor Rgn1; a feedback resistor Rgp connected between a non-inverting input terminal and the output terminal of the operational amplifier; and a transistor switch SW3inserted between the feedback resistor Rgn2and one of the output terminal and the inverting input terminal of the operational amplifier.
REFERENCES:
patent: 7335872 (2008-02-01), Fukuda et al.
patent: 7449670 (2008-11-01), Yamaguchi et al.
patent: 2007/0075222 (2007-04-01), Fukuda et al.
patent: 2007/0075223 (2007-04-01), Murao et al.
patent: 2007/0108374 (2007-05-01), Fukuda et al.
patent: 2007/0228258 (2007-10-01), Yamaguchi et al.
patent: 8-154023 (1996-06-01), None
English language Abstract of JP 8-154023.
Fukuda Hideo
Miyamoto Shinichi
Greenblum & Bernstein P.L.C.
Nguyen Hieu P
Panasonic Corporation
Pascal Robert
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