CONTROLLING THE OUTPUT VOLTAGE OF AN ANTENNA IN A NEAR FILED COMMUNICATION DEVICE

摘要

A near field communication interface comprising an antenna thatoperates as a tapped inductor comprising a plurality of taps, an adaptation circuitry configured to adapt the impedance of the antenna by selecting a tap at which the output voltage is a lowest possible value above a threshold value. A method of adapting the antenna of the NFC is also disclosed and consists of measuring the output voltage Vx at a particular tap at which the input impedance of the antenna is X and selecting a tap at which the input impedance is Y such that Vy=Vx*Y/X is the lowest possible value above the threshold value.