Class-E radio frequency power amplifier with feedback control
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United States of America Patent
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May 19, 2009
Grant Date -
Sep 13, 2007
app pub date -
Feb 23, 2007
filing date -
Feb 24, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A Class-E power amplifier includes a choke and a switch connected in series between a source of a supply voltage and circuit ground and connected to an inductively coupled coil. 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. A feedback signal, indicating an intensity if the signal at the amplifier output node is used to vary the input signal to the Class-E power amplifier and thereby control operation of the switch.
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