Field generator patch with distortion cancellation
First Claim
Patent Images
1. A magnetic field generator, comprising:
- a substrate;
a main generator coil, at least one field sensor, and at least one shim coil, all disposed on the substrate;
a driver circuit, which is coupled to drive the main generator coil with a driving current at a selected frequency; and
a correction circuit, which is coupled to receive a signal at the selected frequency from the at least one field sensor and, in response to deviations in the signal from a predefined baseline, to drive the at least one shim coil with a driving current having an amplitude configured to return the signal to the baseline, the correction circuit being coupled to detect the deviations from the predefined baseline, to estimate the driving current that cancels the deviations, and to drive the at least one shim coil with the estimated driving current.
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Abstract
A magnetic field generator includes a substrate, a main generator coil, at least one field sensor, at least one shim coil, a driver circuit and a correction circuit. The main generator coil, the field sensor, and the shim coil are all disposed on the substrate. The driver circuit is coupled to drive the main generator coil with a driving current at a selected frequency. The correction circuit is coupled to receive a signal at the selected frequency from the at least one field sensor and, in response to deviations in the signal from a predefined baseline, to drive the at least one shim coil with a driving current having an amplitude configured to return the signal to the baseline.
30 Citations
16 Claims
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1. A magnetic field generator, comprising:
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a substrate; a main generator coil, at least one field sensor, and at least one shim coil, all disposed on the substrate; a driver circuit, which is coupled to drive the main generator coil with a driving current at a selected frequency; and a correction circuit, which is coupled to receive a signal at the selected frequency from the at least one field sensor and, in response to deviations in the signal from a predefined baseline, to drive the at least one shim coil with a driving current having an amplitude configured to return the signal to the baseline, the correction circuit being coupled to detect the deviations from the predefined baseline, to estimate the driving current that cancels the deviations, and to drive the at least one shim coil with the estimated driving current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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driving a main generator coil, which is disposed on a substrate, with a driving current at a selected frequency; receiving a signal at the selected frequency from at least one sensing coil that is disposed on the substrate; and in response to deviations in the signal from a predefined baseline, driving at least one shim coil, which is disposed on the substrate, with a driving current having an amplitude configured to return the signal to the baseline, wherein driving the at least one shim coil comprises detecting the deviations from the redefined baseline, estimating the driving current that cancels the deviations, and driving the at least one shim coil with the estimated driving current. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification