Techniques for improving amplifier linearity
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United States of America Patent
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May 3, 2011
Grant Date -
Jun 17, 2010
app pub date -
Dec 12, 2008
filing date -
Dec 12, 2008
priority date (Note) -
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Abstract
Techniques for improving the linearity of a cascode amplifier. In an exemplary embodiment, an auxiliary common-gate amplifier is provided in parallel with the principal cascode branch. The auxiliary common-gate amplifier samples a cascoded node in the principal cascode branch. The auxiliary common-gate amplifier generates a current which, when combined with the current generated by the principal cascode branch, cancels a distortion component to generate an output current with improved linearity characteristics. In an exemplary embodiment, a phase shifting network couples the cascoded node to the auxiliary common-gate amplifier, and may include, e.g., a capacitor coupled to an inductor.
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