Preamplifier

Details Preamplifier Preamplifier

2007-09-11

2007-09-11

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

C330S086000

Reexamination Certificate

active

10543390

ABSTRACT:
A preamplifier includes a negative-feedback amplifier circuit that converts a current signal from a photodetector into a voltage signal; and a conversion-gain control circuit that simultaneously controls a resistance value of a feedback resistor portion of the negative-feedback amplifier circuit and a resistance value of a load resistor portion of the negative-feedback amplifier circuit, based on the voltage signal from the negative-feedback amplifier circuit. Each of the feedback resistor portion and the load resistor portion includes a fixed resistor element, a MOSFET element, and a diode-connected transistor, connected in parallel.

REFERENCES:
patent: 6864751 (2005-03-01), Schmidt et al.
patent: 2005/0140454 (2005-06-01), Uesaka et al.
patent: 0 568 880 (1993-11-01), None
patent: 10-284955 (1998-10-01), None
patent: 2001-144552 (2001-05-01), None
patent: 2002-39827 (2002-02-01), None
patent: 2003-163544 (2003-06-01), None
patent: 2003-347861 (2003-12-01), None
H. Ikeda et al., IEEE Journal of Solid-State Circuits, vol. 36, No. 9, Sep. 2001 pp. 1303-1308.

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