The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 2006
Filed:
Jun. 13, 2003
Ralph Oberhuber, Kumhausen/Landshut, DE;
Wolfgang Steinhagen, Mauern, DE;
Franz Prexl, Niederding, DE;
Ralph Oberhuber, Kumhausen/Landshut, DE;
Wolfgang Steinhagen, Mauern, DE;
Franz Prexl, Niederding, DE;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A transponder () comprising an antenna (), a demodulator () and a signal processing circuit () which converts a modulated signal received via the antenna () into a signal suitable for processing in the demodulator (). The signal processing circuit () comprises an amplifier () with a predefined amplification factor and a closed loop control circuit () serving to maintain the voltage swing of the processed signal applied at the input of the demodulator () substantially constant. In a preferred embodiment the closed loop control circuit comprises a capacitor which is continually discharged and differingly charged as a function of the strength of the output signal of the amplifier of the signal processing circuit, the voltage resulting across the capacitor controlling a controllable resistor connected in parallel to the input of the signal processing circuit and forming with a coupling capacitor a voltage divider.