Method of operating contactless IC card reader, detection circuit of contactless IC card reader, contactless IC card reader and card system including the same

摘要

A method of operating a contactless integrated circuit (IC) card reader includes calculating a first transition time of at least one first magnetic pulse during a first transition interval and calculating a second transition time of a second magnetic pulse during a second transition interval. The first transition time is calculated in a calibration phase, and the second transition time is calculated in a detection phase. A contactless IC card is determined to be within a communication rage of the reader based on a comparison of the first and second transition times.

主权项

1. A method of operating a contactless integrated circuit (IC) card reader, the method comprising:
calculating a first transition time of at least one first magnetic pulse having a first transition interval, the first transition time for which the at least one first magnetic pulse transits between a first level and a reference level in the first transition interval in a calibration phase; calculating a second transition time of a second magnetic pulse having a second transition interval, the second transition time for which the second magnetic pulse transits between a second level and the reference level in the second transition interval in a detection phase; and determining whether a contactless IC card is within a communication range of the contactless IC card reader based on a comparison of the first and second transition times.