HYBRID ACTIVE AND PASSIVE TUNABLE RF FILTERS
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United States of America Patent
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app pub date -
Nov 26, 2014
filing date -
Mar 15, 2013
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Abandoned
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Abstract
RF communications circuitry includes a first RF filter structure, which is disclosed. The first RF filter structure includes a first passive group of RF resonators and active loss-reduction circuitry. The active loss-reduction circuitry is coupled to the first passive group of RF resonators. The active loss-reduction circuitry uses self-limiting positive feedback to reduce signal loss in the first passive group of RF resonators. Additionally, the active loss-reduction circuitry limits the self-limiting positive feedback to prevent self-oscillation in the active loss-reduction circuitry.
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