Passive RF transponder and method
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United States of America Patent
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-
May 14, 1996
Issued Date -
N/A
app pub date -
Feb 10, 1994
filing date -
Feb 10, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A passive RF transponder incorporating a non-volatile memory element is powered by inductive coupling to a proximately located RF controller. A communication system and method is disclosed which utilizes the controller to send data and commands to the transponder by means of an FSK modulated RF signal in order to cause the transponder to either read selected data from, or write selected data to, the non-volatile memory and transmit the same back to the controller utilizing PSK modulation. The communication system and method may be operated in either full duplex or half duplex modes of operation with the controller causing the transponder to simultaneously write data to its non-volatile memory array as the contents are read out and transmitted to the controller by complementing selected bits thereof.
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