Oscillators – With frequency calibration or testing
Reexamination Certificate
2008-07-01
2008-07-01
Mis, David (Department: 2817)
Oscillators
With frequency calibration or testing
C331S175000, C331S179000
Reexamination Certificate
active
07394324
ABSTRACT:
In accordance with one aspect of the present invention, there is provided a method of calibrating an oscillator within a radio-frequency identification (RFID) circuit for use in an RFID tag. The oscillator has an oscillation frequency. A calibration value is stored within a non-volatile memory associated with the RFID circuit. The oscillator is calibrated in accordance with the calibration value. The storing of the calibration value includes recovering a reference frequency from a test signal supplied to the RFID circuit, calculating the calibration value to correspond to a difference between the recovered reference frequency and the oscillator frequency, and writing the calibration value to the non-volatile memory.
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Finkenzeller, Klaus , “Fundamental Operation Principles”,RFID Handbook:: Fundamentals and Applications in Contactless Smart Cards and Identifications, John Wiley & Sons, Ltd ISBN: 0-470-84402-7, (2003),pp.29-59.
Diorio Christopher J.
Gutnik Vadim
Humes Todd E.
Impinj, Inc.
Mis David
Schwegman Lundberg & Woessner, P.A.
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