Variable gain control circuit and integrated circuit device...

Details Variable gain control circuit and integrated circuit device... Variable gain control circuit and integrated circuit device...

2005-02-22

2005-02-22

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

C330S282000, C330S283000

Reexamination Certificate

active

06859105

ABSTRACT:
A variable gain control circuit is provided comprising a bipolar transistor for amplifying an input signal applied to a base, and outputs an output signal via a collector; a serial exchanging unit connected between an emitter of the bipolar transistor; a first voltage node; a parallel exchanging unit connected between the collector of the bipolar transistor and the first voltage node, and wherein the gain of the variable gain control circuit increases in a high gain mode by activating the serial exchanging unit and deactivating the parallel exchanging unit, and the gain of the variable gain control circuit decreases in a low gain mode by deactivating the serial exchanging unit and activating the parallel exchanging unit.

REFERENCES:
patent: 5023569 (1991-06-01), Raven
patent: 6104246 (2000-08-01), La Ferrara et al.
patent: 6388525 (2002-05-01), Bien
patent: 6437649 (2002-08-01), Miyashita et al.
patent: P2001-0042366 (2001-05-01), None
patent: P2002-0016515 (2002-03-01), None

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