Amplifiers – With semiconductor amplifying device – Including class d amplifier
Reexamination Certificate
2005-06-21
2005-06-21
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including class d amplifier
C330S20700P, C330S010000
Reexamination Certificate
active
06909326
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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3M Innovative Properties Comapny
Buss Melissa E.
Nguyen Patricia
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