Circuit and method for power-up optimization of RFID...

Details Circuit and method for power-up optimization of RFID... Circuit and method for power-up optimization of RFID...

2011-01-11

2011-01-11

Tweel, Jr., John A (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C455S123000

Reexamination Certificate

active

07868764

ABSTRACT:
The present invention relates to a radio-frequency identification tag (10) and a related method of operation, whereby the tag comprises an antenna (12) being adapted to draw a voltage from an externally applied RF field having a first frequency, and further comprises a tunable antenna resonant circuit (16) comprising a default resonance frequency and having tuning means (18) for shifting the resonance frequency to the first frequency, whereby non-volatile storage means (22) for storing frequency related data are provided, that are accessible at a reduced voltage level, which is below a “power-up” voltage level of the tag's operating unit (14).

REFERENCES:
patent: 5491715 (1996-02-01), Flaxl
patent: 6317027 (2001-11-01), Watkins
patent: 7132946 (2006-11-01), Waldner et al.
patent: 2009/0102663 (2009-04-01), Hillegass
patent: 2009/0109003 (2009-04-01), Tucker et al.
patent: 2009/0278688 (2009-11-01), Tuttle

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