Resonant circuit with automated trimming capabilities
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United States of America Patent
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Nov 18, 2014
Grant Date -
Jun 19, 2014
app pub date -
Dec 18, 2012
filing date -
Dec 18, 2012
priority date (Note) -
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Abstract
According to an example embodiment, a device includes a resonant circuit configured and arranged to provide a peak current flow at a resonance frequency. A trimming circuit provides variable impedances to the resonant circuit and thereby changes the resonance frequency for the resonant circuit. A driver circuit is configured to generate a trimming signal that oscillates at a desired frequency. A switch circuit couples and decouples the driver circuit to the resonant circuit for driving the resonant circuit with the trimming signal. An amplitude detection circuit detects amplitudes for signals generated in response to the trimming signal being connected to the resonant circuit. A processing circuit correlates detected amplitudes from the amplitude detection circuit with different impedance values of the variable trimming circuit.
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