RFID reader systems with double conversion and methods

RFID readers, reader systems, and methods are provided that utilize double conversion for received tag response signals. A digitized signal is derived from the tag response signal by first shifting the response signal to about DC. The components of the digitized signal are then up converted and down...

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Bibliographische Detailangaben
Hauptverfasser:	SUNDSTROM KURT EUGENE, COOPER SCOTT ANTHONY
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CALCULATING COMPUTING CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING COUNTING DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY FUNCTIONAL ELEMENTS OF SUCH SYSTEMS MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PHYSICS REGULATING SELECTING TRANSMISSION
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Beschreibung
Zusammenfassung:	RFID readers, reader systems, and methods are provided that utilize double conversion for received tag response signals. A digitized signal is derived from the tag response signal by first shifting the response signal to about DC. The components of the digitized signal are then up converted and down converted and filtered such that only components around DC remain. The up converted and down converted signals may then be compared and one selected or the two combined after weighting to enhance demodulation and reduce circuit complexity.