Method and circuit arrangement for holding a control state...

Details Method and circuit arrangement for holding a control state... Method and circuit arrangement for holding a control state...

2005-02-14

2010-06-29

Zimmerman, Brian A (Department: 2612)

Communications: electrical

Selective

Interrogation response

C342S051000

Reexamination Certificate

active

07746216

ABSTRACT:
An RF transponder includes an input circuit, a read/memory circuit, and a circuit arrangement for holding a control state. The circuit arrangement includes a first storage device (e.g. a D-flip-flop) for storing the control state dependent on received control signals, and a second storage device (e.g. a capacitor and a transistor) for holding the control state during a period of inadequate energy supply to the circuit arrangement, e.g. while the transponder is in a field gap of the electromagnetic field emitted by a base station with which the transponder communicates. In an operating method, the control state is held by the second storage device during a period of inadequate energy supply. Then, when adequate energy is again supplied, the transponder resumes the control state that was held by the second storage device. The transponder continues to operate properly according to an anti-collision procedure in a system of several transponders communicating individually with a base station.

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Finkenzeller, RFID Handbuch, (RFID Handbook) “6 Codierung und Modulation”, BNSDOCID:<XP 2249954A 1 >; 1998; pp. 38-42 and 105-117.
English Translation of Finkenzeller, RFID Handbook, BNSDOCID:<XP 2249954A 1>; 1998; pp. 105-117.

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