Untethered device employing tunable resonant circuit
First Claim
1. An untethered device configured to inductively couple to a source device, the source device configured to generate a varying magnetic field having a fixed frequency, the untethered device comprising:
- a tunable resonant circuit having a resonance frequency and configured to generate a supply voltage for the untethered device in response to the varying magnetic field; and
a frequency control circuit coupled to the tunable resonant circuit and configured to produce a control signal using signals developed within the tunable resonant circuit, the control signal useable to adjust the resonance frequency of the tunable resonant circuit to the fixed frequency of the source device.
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Accused Products
Abstract
An untethered device is configured to inductively couple to a source device, which generates a varying magnetic field having a fixed frequency. The untethered device includes a tunable resonant circuit having a resonance frequency and configured to generate a supply voltage for the untethered device in response to the varying magnetic field. The untethered device further includes a frequency control circuit coupled to the tunable resonant circuit and configured to produce a control signal using signals developed within the tunable resonant circuit. The control signal is useable to adjust the resonance frequency of the tunable resonant circuit to the fixed frequency of the source device.
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Citations
20 Claims
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1. An untethered device configured to inductively couple to a source device, the source device configured to generate a varying magnetic field having a fixed frequency, the untethered device comprising:
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a tunable resonant circuit having a resonance frequency and configured to generate a supply voltage for the untethered device in response to the varying magnetic field; and a frequency control circuit coupled to the tunable resonant circuit and configured to produce a control signal using signals developed within the tunable resonant circuit, the control signal useable to adjust the resonance frequency of the tunable resonant circuit to the fixed frequency of the source device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method implemented in an untethered device configured to inductively couple to a source device, the source device configured to generate a varying magnetic field having a fixed frequency, the method comprising:
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generating, by a tunable resonant circuit of the untethered device, a supply voltage for the untethered device in response to the varying magnetic field; sensing signals developed within the tunable resonant circuit, the signals associated with parallel connected inductive and capacitive circuits, respectively, of the tunable resonant circuit; and producing a control signal using the sensed signals, the control signal useable to adjust a resonance frequency of the tunable resonant circuit to the fixed frequency of the source device. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification