Electronic circuit for a contactless reader device

Details Electronic circuit for a contactless reader device Electronic circuit for a contactless reader device

2011-04-19

2011-04-19

Hess, Daniel A (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

Reexamination Certificate

active

07926719

ABSTRACT:
An electronic circuit (12, 12′) for a reader device (10, 10′) for contactless communication with a transponder (20) is disclosed. The electronic circuit (12, 12′) comprises a connection (13a,13b) to an antenna (11) of said reader device (10, 10′), which antenna (11) is designed for receiving a radio signal (TRS) from said transponder (20). Furthermore, it comprises a receiving module (14), which is connected to the antenna connection (13a,13b) and arranged for processing an input voltage (VI) from said antenna (11) representing said radio signal (TRS). To provide satisfactory operation of the receiving module (14) and to compensate a bad matching of the antenna circuit to the electronic circuit (12, 12′) and/or bad environmental conditions where the reader device (10, 10′) is operated, the electronic circuit furthermore comprises a control module (15, 15′). Said control module (15, 15′) is arranged to compare said input voltage (VI) to a reference value (VR) and to adjust a plant of said reader device (10, 10′) in such a manner that the level of said input voltage (VI) stays in a predefined range. The invention furthermore relates to a reader device (10, 10′) and a method of operating a reader device (10, 10′).

REFERENCES:
patent: 5619529 (1997-04-01), Fujioka
patent: 7602274 (2009-10-01), Lee et al.
patent: 1713185 (2006-10-01), None
patent: 9943096 (1999-08-01), None
patent: 2005074158 (2005-08-01), None

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