Resonant inductive sensing with reduced noise folding
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United States of America Patent
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Nov 7, 2017
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app pub date -
Dec 30, 2014
filing date -
Jan 2, 2014
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Abstract
A resonant inductive sensing system includes in the drive current signal path of the resonator a pulse shaper for noise reduction, including reducing noise resulting from down modulation of signal energy around harmonics of the oscillator (multiples of the resonance frequency), and from uncertainty in the duration of the oscillation period. The pulse shaper is configured so that, for each modulation period of the drive current, consecutive drive current pulses are substantially identical. In example embodiments, an inductance-to-digital conversion (IDC) unit includes drive circuitry configured to drive excitation current pulses to the resonator with a modulation period synchronized with a resonator oscillation frequency, and pulse shaping circuitry configured to pulse shape the drive current pulses so that each pair of drive current pulses within a modulation period are substantially identical.
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