Amplifier with gain expansion stage
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United States of America Patent
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Oct 11, 2011
Grant Date -
Dec 24, 2009
app pub date -
Jun 20, 2008
filing date -
Jun 20, 2008
priority date (Note) -
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Abstract
Techniques are disclosed for extending an amplifier's linear operating range by concatenating an amplifier exhibiting gain compression with a gain expansion stage. In an exemplary embodiment, a gain expansion stage incorporates a Class-B stage, a Class-AB stage, or a combination of the two. In an exemplary embodiment, both the gain compression stage and gain expansion stage are provided with a replica current biasing scheme to ensure stable biasing current over variations in temperature, process, and/or supply voltage. Further disclosed is an output voltage biasing scheme to set the DC output voltage to ensure maximum linear operating range.
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