Adaptable voltage control for a variable gain amplifier

Details Adaptable voltage control for a variable gain amplifier Adaptable voltage control for a variable gain amplifier

2005-12-27

2005-12-27

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S278000

Reexamination Certificate

active

06980053

ABSTRACT:
A method and apparatus for adaptively controlling a variable gain amplifier (VGA). The operation of the VGA is separated into a low gain mode and a high gain mode and the mode in which the VGA is currently operating in is adaptively sensed. A threshold voltage is compared to a control voltage of the VGA; if the VGA is currently operating in the low gain mode and the control voltage is higher than the threshold voltage, the VGA is switched from the low gain mode to the high gain mode; and if the VGA is currently operating in the high gain mode and the control voltage is lower than the threshold voltage, the VGA is switched from the high gain mode to the low gain mode.

REFERENCES:
patent: 6169452 (2001-01-01), Popescu et al.
patent: 6297698 (2001-10-01), Callahan, Jr.
patent: 6404283 (2002-06-01), Lau et al.

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