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Radio-frequency-identification-system

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Radio frequency identification system

Details

Inventors: Geiszler, Kenneth; Walker, Russel E.; Whiston, Kenneth Alan; Kwong, Jon; Lindseth, Dale;
Assignee: Keri Systems, Inc. (San Jose, CA)
Primary Examiner: Horabik; Michael
Assistant Examiner: Shimizu; M
Attorney, Agent or Firm: Thelen Reid & Priest LLP, Ritchie; David B.

A radio frequency identification system includes a transponder and a transponder reader. The transponder, responsive to an interrogation signal continuously transmitted by the transponder reader, generates a transponder signal modulated by an identification signal readable by the transponder reader. The identification signal includes a synchronization portion, a data portion, an output format identification portion, and an error detection portion. The output format identification portion is used by the reader to configure itself for communication with an attached controller. In another aspect of the invention, the transponder reader may be configured to read FSK as well as PSK encoded signals from the transponder.

DETAILED DESCRIPTION A radio frequency identification system includes a transponder and a transponder reader.
The transponder, responsive to an interrogation signal continuously transmitted by the transponder reader, generates a transponder signal modulated by an identification signal readable by the transponder reader.
The identification signal includes a synchronization portion, a data portion, an output format identification portion, and an error detection portion.
The output format identification portion is used by the reader to configure itself for communication with an attached controller.
In another aspect of the invention, the transponder reader may be configured to read FSK as well as PSK encoded signals from the transponder.

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