Amplifier modulation
First Claim
1. An apparatus comprising:
- a class E amplifier having a first transistor;
a second transistor controlling a current path in parallel to the first transistor; and
a controller to control the first and second transistors.
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Accused Products
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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Citations
16 Claims
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1. An apparatus comprising:
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a class E amplifier having a first transistor;
a second transistor controlling a current path in parallel to the first transistor; and
a controller to control the first and second transistors. - View Dependent Claims (2, 3, 4, 5)
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6. An amplifier comprising:
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a first transistor;
an inductor coupling the first transistor to a supply voltage via a first resistor;
a shunt capacitor connected in parallel to the first transistor;
a second transistor connected to the inductor by a second resistor, wherein the second transistor controls a current path in parallel to the first transistor and the capacitor;
a third transistor connected in parallel to the first resistor; and
a controller coupled to the first, second and third transistors. - View Dependent Claims (7, 8, 9, 10, 11)
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12. An apparatus comprising:
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a class E amplifier having a first transistor and an inductor coupling the first transistor to a supply voltage via a first resistor;
a second transistor connected in parallel to the first resistor; and
a controller coupled to the first and second transistors. - View Dependent Claims (13, 14, 15, 16)
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Specification