MEASURING ANTENNA MATCHING VIA TRANSMITTER CURRENT DRAW
First Claim
Patent Images
1. An implantable telemetry system comprising:
- a radio frequency (RF) transceiver configured to drive an antenna at a specified operating frequency;
a matching circuit configured to be coupled to the antenna, the matching circuit having a control parameter configured to adjust the impedance of the matching circuit; and
a control circuit configured to receive an indication of RF transceiver current draw and to control the control parameter using the received indication of current draw.
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Abstract
This document discusses, among other things, an implantable telemetry system including an RF transceiver configured to drive an antenna and a matching circuit, configured to be coupled to the antenna, the matching circuit including a control parameter configured to adjust the impedance of the matching circuit. The implantable telemetry system also includes a control circuit configured to receive an indication of the RF transceiver current draw and to control the control parameter of the matching circuit using the received indication of current draw. In an example, the control parameter is controlled to decrease the RF transceiver current draw.
22 Citations
20 Claims
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1. An implantable telemetry system comprising:
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a radio frequency (RF) transceiver configured to drive an antenna at a specified operating frequency; a matching circuit configured to be coupled to the antenna, the matching circuit having a control parameter configured to adjust the impedance of the matching circuit; and a control circuit configured to receive an indication of RF transceiver current draw and to control the control parameter using the received indication of current draw. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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driving an antenna at a specified operating frequency with a radio frequency (RF) transceiver; receiving an indication of a current draw of the RF transceiver; controlling a control parameter of a matching circuit for the antenna using the detected current to decrease the RF transceiver current draw, wherein the control parameter is configured to adjust an impedance of the matching circuit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An implantable medical device comprising:
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an antenna; a matching circuit coupled to the antenna, the matching circuit configured to vary a control parameter of the matching circuit; a radio frequency (RF) transceiver coupled to the matching circuit; a power supply coupled to the RF transceiver; a current sensor configured to detect a current between the power supply and the RF transceiver as the matching circuit varies the control parameter across a range of values; a control circuit configured to compare the detected current to a current threshold; and wherein the control circuit is configured to set the control parameter to a setting that corresponds to a current draw below the current threshold. - View Dependent Claims (20)
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Specification