Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

2007-11-06

2007-11-06

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S285000, C330S296000

Reexamination Certificate

active

11057304

ABSTRACT:
A variable gain amplifier is disclosed where the gain of the amplifier is controlled by a variable emitter resistor that is responsive to a control signal. The variable resistor includes a resistor connected between the collector and emitter of a control transistor. A control signal applied to the base of the control transistor varies the gain of the amplifier from a minimum gain when the control transistor is cut-off to a maximum gain when the control transistor is saturated.

REFERENCES:
patent: 6175279 (2001-01-01), Ciccarelli et al.
patent: 6693492 (2004-02-01), Desize
patent: 6753734 (2004-06-01), Arell et al.
patent: 6859105 (2005-02-01), Ahn
patent: 7034606 (2006-04-01), Caresosa et al.

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