Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

2006-06-27

2006-06-27

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S086000

Reexamination Certificate

active

07068107

ABSTRACT:
The variable gain amplifier of the present invention includes at least an operation amplifier. By choosing one of output stages, a feedback resistor is selected and the gain of the variable gain amplifier is decided according to the resistance of the selected feedback resistor, as desired. By adjusting the gain of the variable gain amplifier, the received signals can be amplified or attenuated in accordance with design requirement. The variable gain amplifier can include a two-stage architecture, in which a first stage is used for coarse gain adjustment and a second stage is used for fine gain adjustment. The gain of the two-stage variable gain amplifier can be easily adjusted to a desired value.

REFERENCES:
patent: 5399986 (1995-03-01), Yen
patent: 5668494 (1997-09-01), Nicollini et al.
patent: 6400541 (2002-06-01), Brett

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