Variable gain amplifier
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United States of America Patent
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May 18, 2004
Grant Date -
Nov 6, 2003
app pub date -
May 3, 2002
filing date -
May 3, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a variable gain amplifier with a plurality of gain stages in which each of the gain stages is implemented using a circuit that implements a neutralization approach. This variable gain amplifier provides stable operation characteristics as different gain stages within the variable gain amplifier are turned on and off. This variable gain amplifier also increases linearity across the entire operating range. Additionally, the variable gain amplifier of the present invention provides a constant input impedance through different gain settings. Further, the present invention provides a variable gain amplifier in which each of the various gain stages therein maximize the available voltage swing. Finally, this variable gain amplifier improves common-mode rejection performance and attenuates unwanted harmonics.
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