High stability fast start up oscillator for implants
First Claim
1. An oscillator for use within an implantable medical device comprising:
- a resonator;
a first switch coupled to a first resistive network, the first resistive network providing a first electrical path through the first switch and a second electrical path bypassing the first switch, wherein the second electrical path with the first switch opened has a substantially higher resistance than the first electrical path when the first switch is closed;
a second switch coupled to a second resistive network, the second resistive network providing a third electrical path through the second switch and a fourth electrical path bypassing the second switch, wherein the fourth electrical path with the second switch opened has a substantially higher resistance than the third electrical path when the second switch is closed; and
a transistor, the base terminal coupled with the first resistive network and the resonator and the emitter terminal coupled to the second resistive network,whereinthe oscillator operates in a first mode when the first and second switches are open and operates in a second mode when the first and second switches are closed; and
the oscillator transitions from operating in the first mode to operating in the second mode in less than 1 ms when the first and second switches are closed.
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Accused Products
Abstract
An oscillator for use within an implantable medical device is provided. The oscillator includes a resonator and a first switch coupled to a first resistive network. The first resistive network provides a first electrical path through the first switch and a second electrical path not going through the switch. The oscillator additionally includes a second switch coupled to a second resistive network. The second resistive network provides a third electrical path through the second switch and a fourth electrical path not going through the switch. Furthermore, the oscillator includes a transistor, the base terminal coupled with the first resistive network and the resonator and the emitter terminal coupled to the fourth resistor. The second electrical path with the first switch opened has a substantially higher resistance than the first electrical path when the first switch is closed. In addition, the fourth electrical path with the second switch opened has a substantially higher resistance than the third electrical path when the second switch is closed.
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Citations
20 Claims
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1. An oscillator for use within an implantable medical device comprising:
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a resonator; a first switch coupled to a first resistive network, the first resistive network providing a first electrical path through the first switch and a second electrical path bypassing the first switch, wherein the second electrical path with the first switch opened has a substantially higher resistance than the first electrical path when the first switch is closed; a second switch coupled to a second resistive network, the second resistive network providing a third electrical path through the second switch and a fourth electrical path bypassing the second switch, wherein the fourth electrical path with the second switch opened has a substantially higher resistance than the third electrical path when the second switch is closed; and a transistor, the base terminal coupled with the first resistive network and the resonator and the emitter terminal coupled to the second resistive network, wherein the oscillator operates in a first mode when the first and second switches are open and operates in a second mode when the first and second switches are closed; and the oscillator transitions from operating in the first mode to operating in the second mode in less than 1 ms when the first and second switches are closed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 20)
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13. A method of operation for a dual-mode oscillator comprising:
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providing an oscillator including a resonating element, a base switch and an emitter switch, the base switch being coupled to a first resistive network and the emitter switch being coupled to a second resistive network; operating the oscillator within a first current mode wherein the base and emitter switches are open and a first current is applied to the resonating element through the first and second resistive networks; receiving a signal from an external source to switch the oscillator to a second current mode; and operating the oscillator within the second current mode wherein the base and emitter switches are closed providing a lower resistance path through the first and second resistive networks for a second current applied to the resonating element, the second current being substantially larger than the first current; wherein a transition from the first current mode to the second current mode occurs in less than 1 ms when the base and emitter switches are closed. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification