Feed forward amplifier with multiple cancellation loops capable of reducing intermodulation distortion and receive band noise
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United States of America Patent
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Issued Date -
Jan 12, 2006
app pub date -
Jun 15, 2005
filing date -
Jul 8, 2004
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Abandoned
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Abstract
An embodiment of the present invention provides an apparatus, comprising a feed forward amplifier capable of receiving an input signal and including a plurality of cancellation loops, wherein at least one of the cancellation loops includes a tunable delay line enabling the reduction of intermodulation distortion and receive band noise when outputs from the plurality of cancellation loops are combined with the input signal to the feed forward amplifier. In an embodiment of the present invention the plurality of cancellation loops may be two cancellations loops and a tunable delay line may be included in both of the cancellation loops. Further, the tunable delay line may be a voltage tunable delay line that includes a voltage tunable dielectric capacitor to facilitate the control of the tunable delay and the voltage tunable dielectric capacitor may include a layer of voltage tunable dielectric material positioned on a surface of a low loss, low dielectric substrate.
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