Amplifier modulation
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United States of America Patent
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Jun 21, 2005
Grant Date -
Sep 23, 2004
app pub date -
Mar 31, 2004
filing date -
Oct 15, 2001
priority date (Note) -
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Abstract
In general, the invention is directed to an efficient amplifier for use in radio-frequency identification (RFID) applications. In particular, the invention provides a highly efficient amplifier that requires little power, yet has significant modulation bandwidth to achieve high data communication rates. The amplifier makes use of many components of a class E amplifier including a first transistor, an inductor coupling the first transistor to a power supply, and a shunt capacitor connected in parallel to the first transistor. A second transistor is connected in parallel to the first transistor. A controller selectively controls the first and second transistors to achieve amplitude modulation at a high modulation bandwidth.
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