Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

2006-05-02

2006-05-02

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000, C330S295000

Reexamination Certificate

active

07038542

ABSTRACT:
A variable gain amplifier includes a first constant current amplifier configured to generate a reference current from an input signal. A controller is configured to generate a bias current and a first control signal based on control voltage. An addition current generator is configured to generate a variable current from the input signal based on the bias current, and to generate a addition current by controlling the variable current in accordance with the first control signal. An adder is configured to generate a first output signal by adding the reference current and the addition current.

REFERENCES:
patent: 4904952 (1990-02-01), Tanimoto
patent: 5418494 (1995-05-01), Betti et al.
patent: 6084466 (2000-07-01), Phanse et al.
patent: 6683499 (2004-01-01), Lautzenhiser et al.
patent: 6850109 (2005-02-01), Kimura
patent: 2003-188667 (2003-07-01), None

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