Suspended carrier modulation of high-Q transmitters
First Claim
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1. In a high-Q resonant circuit transmitter, the improvement comprising:
- control means for on-off modulation of a transmitter coil current whereby said transmitter coil current is substantially instantaneously interrupted at a zero-crossing of said transmitter coil current; and
switching means having conducting and non-conducting states, said control means causing said switching means to switch between said conducting state and said non-conducting state in synchronization with said zero-crossings of said transmitter coil current.
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Abstract
A method for on-off modulation of a transmitter coil current of a high-Q resonant circuit transmitter comprising the steps of sensing a zero-crossing of the transmitter coil current and substantially instantaneously interrupting the transmitter coil current, and a high-Q resonant circuit transmitter for carrying out said method.
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Citations
14 Claims
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1. In a high-Q resonant circuit transmitter, the improvement comprising:
control means for on-off modulation of a transmitter coil current whereby said transmitter coil current is substantially instantaneously interrupted at a zero-crossing of said transmitter coil current; and
switching means having conducting and non-conducting states, said control means causing said switching means to switch between said conducting state and said non-conducting state in synchronization with said zero-crossings of said transmitter coil current.- View Dependent Claims (2, 3, 4)
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5. A method for on-off modulation of a transmitter coil current of a high-Q resonant circuit transmitter comprising:
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sensing a zero-crossing of said transmitter coil current; and substantially instantaneously interrupting said transmitter coil current; wherein operation of said high-Q resonant circuit transmitter during said on period is independent of operation during said off period. - View Dependent Claims (6, 7, 8, 9)
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10. A power and communication system for an implantable device for use in functional electrical stimulation comprising:
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a high-Q resonant circuit transmitter; and control means for on-off modulation of a transmitter coil current whereby said transmitter coil current is substantially instantaneously interrupted at a zero-crossing of said transmitter coil current; and switching means having conducting and non-conducting states, said control means causing said switching means to switch between said conducting state and said non-conducting state in synchronization with said zero-crossings of said transmitter coil current. - View Dependent Claims (11, 12, 13, 14)
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Specification