Circuit, system and method for far-field radiative powering of an implantable medical device
First Claim
1. An isolated circuit comprising:
- a RF input configured to receive a far field radiative powering signal;
a matching network configured to provide a matched impedance voltage of the RF input to other components of the isolated circuit;
a voltage rectifier configured to provide a rectified voltage based on the received far field radiative powering signal;
a first switching network comprising;
a first power assembly comprising a first impedance coupled between the RF input and the matching network, the first impedance provided, at least in part, by activating a first switch in response to the rectified voltage satisfying a first voltage threshold; and
a second power assembly comprising a second impedance coupled between the RF input and the matching network, the second impedance provided, at least in part, by activating the first switch and a second switch in response to the rectified voltage satisfying the first voltage threshold and a second voltage threshold, respectively; and
a second switching network comprising;
a third power assembly comprising a third impedance coupled between the matching network and the voltage rectifier, the third impedance provided, at least in part, by activating a third switch in response to the rectified voltage satisfying a third voltage threshold; and
a fourth power assembly comprising a fourth impedance coupled between the matching network and the voltage rectifier, the fourth impedance provided, at least in part, by activating the third switch and a fourth switch in response to the rectified voltage satisfying the third voltage threshold and a fourth voltage threshold, respectively.
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Accused Products
Abstract
An isolated circuit including a RF input configured to receive a far field radiative powering signal and a rectified voltage output configured to provide a rectified voltage based on the received far field radiative powering signal. The isolated circuit also includes a first power assembly comprising a first impedance coupled to the RF input where the first impedance is provided, at least in part, by activating a first switch in response to the rectified voltage satisfying a first voltage threshold. The isolated circuit also includes a second power assembly comprising a second impedance coupled to the RF input where the second impedance is provided, at least in part, by activating the first switch and a second switch in response to the rectified voltage satisfying the first voltage threshold and a second voltage threshold, respectively.
71 Citations
19 Claims
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1. An isolated circuit comprising:
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a RF input configured to receive a far field radiative powering signal; a matching network configured to provide a matched impedance voltage of the RF input to other components of the isolated circuit; a voltage rectifier configured to provide a rectified voltage based on the received far field radiative powering signal; a first switching network comprising; a first power assembly comprising a first impedance coupled between the RF input and the matching network, the first impedance provided, at least in part, by activating a first switch in response to the rectified voltage satisfying a first voltage threshold; and a second power assembly comprising a second impedance coupled between the RF input and the matching network, the second impedance provided, at least in part, by activating the first switch and a second switch in response to the rectified voltage satisfying the first voltage threshold and a second voltage threshold, respectively; and a second switching network comprising; a third power assembly comprising a third impedance coupled between the matching network and the voltage rectifier, the third impedance provided, at least in part, by activating a third switch in response to the rectified voltage satisfying a third voltage threshold; and a fourth power assembly comprising a fourth impedance coupled between the matching network and the voltage rectifier, the fourth impedance provided, at least in part, by activating the third switch and a fourth switch in response to the rectified voltage satisfying the third voltage threshold and a fourth voltage threshold, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable medical device, comprising:
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an antenna; a matching network coupled to the antenna, the antenna and the matching network together configured to receive a far field radiative powering signal, the matching network configured to provide a matching impedance of the antenna to other components of the implantable medical device; a voltage rectifier coupled to the matching network, the voltage rectifier configured to rectify the received far field radiative powering signal and to output a rectified voltage based on the received far field radiative powering signal; a first impedance feedback circuit configured to adjust the matching impedance of the matching network comprising; a first switch coupled between the antenna and the matching network and a second switch coupled between the antenna and the matching network, the first switch configured to couple a first impedance between the antenna and the matching network when the first switch is activated in response to the rectified voltage satisfying a first voltage threshold, the second switch configured to couple a second impedance between the antenna and the matching network when the second switch is activated in response to the rectified voltage satisfying a second voltage threshold; and a second impedance feedback circuit comprising; a third switch coupled between the matching network and the voltage rectifier and a fourth switch coupled between the matching network and the voltage rectifier, the third switch configured to couple a third impedance between the matching network and the voltage rectifier when the third switch is activated in response to the rectified voltage satisfying a third voltage threshold, the fourth switch configured to couple a fourth impedance between the matching network and the voltage rectifier when the fourth switch is activated in response to the rectified voltage satisfying a fourth voltage threshold. - View Dependent Claims (14, 15, 16)
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17. An antenna assembly, comprising:
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a receiving element configured to receive a far field powering signal; a load coupled to the receiving element, the load having a load impedance that varies non-linearly with variations in the far field powering signal, the load comprising; a matching network coupled to the receiving element; a voltage rectifier coupled to the matching network, the voltage rectifier configured to output a rectified voltage based on the received far field radiative powering signal; a first impedance feedback circuit coupled between the matching network and the voltage rectifier, the first impedance feedback circuit configured to activate a first switch when the rectified voltage reaches a first rectified voltage threshold and to activate a second switch when the rectified voltage reaches a second rectified voltage threshold, the first switch configured to couple a first impedance to the load to adjust the load impedance when the first switch is activated, the second switch is configured to couple a second impedance to the load to adjust the load impedance when the second switch is activated; and a second impedance feedback circuit coupled between the receiving element and the matching network, the second impedance feedback circuit configured to activate a third switch when the rectified voltage reaches a third rectified voltage threshold and to activate a fourth switch when the rectified voltage reaches a fourth rectified voltage threshold, the third switch configured to couple a third impedance to the load to adjust the load impedance when the third switch is activated, the fourth switch is configured to couple a fourth impedance to the load to adjust the load impedance when the fourth switch is activated. - View Dependent Claims (18, 19)
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Specification