| 摘要 |
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 ( 13 a, 13 b) 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 ( 13 a, 13 b) 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 ').
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