Variable gain amplifier with constant input referred third...

Details Variable gain amplifier with constant input referred third... Variable gain amplifier with constant input referred third...

2006-02-16

2008-11-04

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S253000

Reexamination Certificate

active

07446608

ABSTRACT:
Variable gain amplifier (VGA) circuits and methods implemented in such circuits are disclosed. An example VGA circuit includes a differential transistor pair for receiving a differential input signal. The differential transistor pair, in operation, conducts a substantially constant current over a linear operating range of the variable gain amplifier circuit. The VGA circuit also includes a current source that is coupled with the differential transistor pair. The current source, in operation, provides the substantially constant current to the differential transistor pair. The VGA circuit further includes a variable resistance circuit coupled with the differential transistor pair. In operation, a resistance of the variable resistance circuit is adjusted such that a gain of the variable gain amplifier circuit is adjusted. Further, in operation, the VGA circuit produces a differential output signal, the differential output signal being an amplified version of the differential input signal.

REFERENCES:
patent: 6710659 (2004-03-01), Teramoto et al.
patent: 6771124 (2004-08-01), Ezell
patent: 7034606 (2006-04-01), Caresosa et al.
patent: 7078968 (2006-07-01), Gaeta et al.

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