Radio frequency identification device
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United States of America Patent
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N/A
Issued Date -
N/A
app pub date -
Sep 3, 2004
filing date -
Jun 2, 1998
priority date (Note) -
Abandoned
status (Latency Note)
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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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