Method and device for synchronizing signals within a contactless device
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United States of America Patent
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Apr 28, 2020
Grant Date -
Jul 18, 2019
app pub date -
Jan 4, 2019
filing date -
Jan 15, 2018
priority date (Note) -
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Abstract
A contactless communication device is capable of communicating in a contactless way with a reader by using active load modulation. Each frame is preceded by a reception period. An antenna is configured to receive a reader signal during each reception period, and to receive a reader carrier signal and transmit a modulated device carrier signal to the reader during each frame. A processor is configured to carry out, in each reception period, a first synchronization between a signal originating from the reader signal received at the antenna and a device carrier clock signal device generated in the device. The processor is also configured to carry out, within each frame, a modulated device carrier signal suppression process in order to obtain a processed signal, and a second synchronization between the processed signal and the device carrier clock signal.
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