Gain variable amplifier

Details Gain variable amplifier Gain variable amplifier

2006-01-30

2008-11-25

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

C330S254000

Reexamination Certificate

active

07456692

ABSTRACT:
A gain variable amplifier according to an embodiment of the present invention includes: an amplifier circuit amplifying an input signal with a variable gain; and a gain control circuit controlling the gain of the amplifier circuit based on a gain control signal, in which the amplifier circuit includes: an amplifying element amplifying the input signal; an output element series-connected with the amplifying element and outputting a signal amplified with the amplifying element; and a bias circuit changing a potential at a node between the output element and the amplifying element based on the gain control of the gain control circuit.

REFERENCES:
patent: 6259901 (2001-07-01), Shinomiya et al.
patent: 7242251 (2007-07-01), Boos
patent: 2002-16458 (2002-01-01), None

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