A method of operating a contactless IC card reader, a detection circuit of a contactless IC card reader, a contactless IC card reader including the same and card system

摘要

A method of operating a contactless IC card reader includes calculating a first transition time during a first transition period from a first constant level to a reference level of at least one first magnetic pulse in a calibration phase; Calculating a second transition time during a second transition period from the second constant level of the second magnetic pulse to the reference level in the detection phase; And determining whether the contactless integrated circuit card is within communication coverage of the contactless integrated circuit card reader based on the comparison of the first transition time and the second transition time.