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:
Dec. 21, 2010
Filed:
Jul. 30, 2008
Oliver Nehrig, Kirchdorf, DE;
Carlo Peschke, Freising Bayern, DE;
Ernst Muellner, Munich Bayern, DE;
Adolf Baumann, Haag an der Amper, DE;
Jens Graul, Freising Bayern, DE;
Oliver Nehrig, Kirchdorf, DE;
Carlo Peschke, Freising Bayern, DE;
Ernst Muellner, Munich Bayern, DE;
Adolf Baumann, Haag an der Amper, DE;
Jens Graul, Freising Bayern, DE;
Texas Instruments Deutschland GmbH, Freising, DE;
Abstract
An ASK demodulator for use in an RFID transponder having a limiter circuit associated with the antenna circuit and converting the ASK antenna field strength modulation into an ASK limiter current modulation by limiting the antenna voltage to a fixed value and thereby causing the limiter current to be substantially proportional to the ASK antenna field strength, and a current discriminator circuit that discriminates the ASK limiter current modulation. By converting the field strength modulation into a proportional limiter current and discriminating that limiter current, a linear relationship and a stable demodulator sensitivity are achieved. The current discrimination can be made accurately under low-voltage conditions.