Class-E radio frequency amplifier for use with an implantable medical device
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United States of America Patent
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Aug 3, 2010
Grant Date -
Sep 13, 2007
app pub date -
Feb 23, 2007
filing date -
Feb 24, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A medical apparatus includes an extracorporeal power source that transmits electrical power via a radio frequency signal to a medical device implanted inside an animal. The extracorporeal power source has a Class-E amplifier with a choke and a semiconductor switch connected in series between a source of a supply voltage and circuit ground. An output node of the amplifier is formed between choke and the switch and connected to a transmitter antenna. A shunt capacitor couples the amplifier's output node to the circuit ground. Controlled operation of the switch produces bursts of the radio frequency signal that are pulse width modulated to control the amount of energy being sent to the implanted medical device.
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