METHOD AND SYSTEM FOR IMPROVING LINEARITY OF AN AMPLIFIER BY MEANS OF IM3 CANCELATION
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United States of America Patent
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Issued Date -
Dec 6, 2012
app pub date -
May 31, 2012
filing date -
Jun 2, 2011
priority date (Note) -
Abandoned
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Abstract
An amplifier for providing improved third-order intermodulation (IM3) cancelation. The amplifier may comprise a main branch for amplifying input signals and an auxiliary branch for generating IM3 signals that are equal to corresponding IM3 components resulting from amplifying input signals via the main branch, with both of the main and the auxiliary branches being configured as differential circuits. The differential implementation may result in the auxiliary branch generating IM3 distortion signals with minimal or no non-IM3 signals. Each of the main and the auxiliary branches may comprise at least two transistor elements. Separate bias current sources may be applied to each of the main and the auxiliary branches. Operation of the auxiliary branch may be controlled by adjusting one or both of the bias current sources. Outputs of the main and the auxiliary branches may be cross-coupled, to invert a sign of IM3 distortion signals generated via the auxiliary branch.
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