FILTER CIRCUIT WITH VARIABLE CAPACITANCE FOR USE WITH IMPLANTABLE MEDICAL DEVICES
First Claim
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1. A filter circuit for a sense circuit of an implantable medical device, the filter circuit comprising:
- an input node for a sensor signal;
a reference node corresponding to a reference potential for the implantable medical device;
a variable capacitor element coupled between the input node and the reference node; and
an electronic control module coupled to the variable capacitor element, the electronic control module being configured to adjust capacitance of the variable capacitor element to accommodate varying operating conditions of the implantable medical device.
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Abstract
An implantable medical device (IMD) as described herein includes an input filter circuit having variable capacitor elements that can be electronically adjusted based upon current operating conditions (such as electromagnetic conditions, noise conditions, and/or environmental conditions). The variable capacitor elements can be adjusted to accommodate pre-designated operating modes of the IMD and/or dynamically in response to changing operating conditions. In one embodiment, the variable capacitor elements are realized using digitally programmable switched capacitor arrangements.
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Citations
19 Claims
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1. A filter circuit for a sense circuit of an implantable medical device, the filter circuit comprising:
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an input node for a sensor signal; a reference node corresponding to a reference potential for the implantable medical device; a variable capacitor element coupled between the input node and the reference node; and an electronic control module coupled to the variable capacitor element, the electronic control module being configured to adjust capacitance of the variable capacitor element to accommodate varying operating conditions of the implantable medical device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An implantable medical device comprising:
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a sense circuit configured to process a sensor signal, the sense circuit having an input node for the sensor signal; a reference node corresponding to a reference potential for the implantable medical device; a filter circuit configured to filter noise from the sensor signal, the filter circuit comprising a variable capacitor element coupled between the input node and the reference node; and an electronic control module for the variable capacitor element, the electronic control module being configured to adjust capacitance of the variable capacitor element. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of operating an implantable medical device having an input node, a reference node corresponding to a reference potential, and a variable capacitor element coupled between the input node and the reference node, the method comprising:
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electronically adjusting capacitance of the variable capacitor element in accordance with an operating condition of the implantable medical device; obtaining a sensor signal at the input node; and filtering noise from the sensor signal using the variable capacitor element. - View Dependent Claims (16, 17, 18, 19)
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Specification