Radio frequency identification device
11 Assignments
0 Petitions
Accused Products
Abstract
A radio frequency identification device includes a transceiver having a resonant circuit, a rectifier, a charge pump, a state machine, and a transmitter. The resonant circuit includes an antenna and has a resonant frequency. The rectifier is coupled to the resonant circuit to provide a rectified signal in response to energy from the antenna. The charge pump is enabled in response to the rectified signal to provide a first logic signal. The state machine provides a second logic signal in response to the first logic signal. The transmitter includes an amplifier coupled to the resonant circuit to form a Colpitts oscillator that is enabled by the second logic signal to transmit a response signal for identifying the radio frequency identification device.
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Citations
32 Claims
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1-27. -27. (canceled)
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28. A transceiver comprising:
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a. a resonant circuit having a resonant frequency, the resonant circuit comprising an antenna;
b. a rectifier coupled to the resonant circuit to provide a rectified signal in response to energy from the antenna;
c. a charge pump enabled in response to the rectified signal to provide a first logic signal;
d. a state machine that provides a second logic signal in response to the first logic signal; and
e. a transmitter comprising an amplifier coupled to the resonant circuit to form a Colpitts oscillator that is enabled by the second logic signal. - View Dependent Claims (29, 30)
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31. A transceiver comprising:
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a. means for receiving radio frequency energy via an antenna to provide a rectified signal;
b. means for accumulating a charge from the rectified signal to provide a first logic signal;
c. means for providing a second logic signal a time after receipt of the first logic signal; and
d. a Colpitts oscillator enabled by the second logic signal for transmitting a response signal via the antenna.
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32-40. -40. (canceled)
Specification