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:
May. 14, 2013
Filed:
Jul. 07, 2008
Patrik Smets, Nijlen, BE;
Eddy Lodewijk Hortensia Van DE Velde, Leuven, BE;
Duncan Garrett, London, GB;
David Anthony Roberts, Warrington, GB;
Patrik Smets, Nijlen, BE;
Eddy Lodewijk Hortensia Van De Velde, Leuven, BE;
Duncan Garrett, London, GB;
David Anthony Roberts, Warrington, GB;
Mastercard International Incorporated, Purchase, NY (US);
Abstract
A system and method for testing and calibrating electronic contactless payment devices including reference payment cards and readers. The contactless payment devices transmit data by load modulating a subcarrier of an RF carrier signal. The system and method involve use of a common mode rejection (CMR) circuit to demodulate a received load-modulated data signal and to extract the data signal. The CMR circuit also generates a synchronous clock signal, a sample & hold signal and a sample & hold clock signal. Further, the input signal is feed to a zero-crossing detector and digital delay which in combination with an Analog-to-Digital Converter circuit is used to recreate the load (i.e. modulating) signal and to eliminate the large carrier portion of the selected input signal.