公开(公告)号：US20190222263A1

公开(公告)日：2019-07-18

申请号：US16239666

申请日：2019-01-04

Applicant: STMicroelectronics (Grenoble 2) SAS

Inventor： Philippe Graffouliere ,  Bruno Paille

IPC: H04B5/00 ,  H04L27/148 ,  H04W4/80 ,  H04L7/02

CPC classification number: H04B5/0031 ,  H04L7/0012 ,  H04L7/033

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.