公开(公告)号：US20230223948A1

公开(公告)日：2023-07-13

申请号：US18069459

申请日：2022-12-21

Applicant: STMicroelectronics SA ,  STMicroelectronics (Genoble2) SAS

Inventor： Julien Goulier ,  Franck Montaudon

IPC: H03M1/12 ,  H04B5/00

CPC classification number: H03M1/124 ,  H04B5/0031

Abstract: The present disclosure concerns an electronic device connected to an antenna. The electronic device delivers a first amplitude-modulated analog signal of a signal captured by the antenna, the capture signal associated with an electromagnetic field exhibiting intervals at a minimum level. The electronic device includes a first circuit, a second circuit, and a third circuit. The first circuit delivers a second analog signal by rectification and filters the first analog signal. The second circuit delivers a first binary signal based on the demodulation of the second analog signal. The third circuit couples the antenna to a resistor during each pause. The resistance value of the resistor depends on the maximum amplitude of the electromagnetic field before the pause.

公开(公告)号：US20230385593A1

公开(公告)日：2023-11-30

申请号：US18316964

申请日：2023-05-12

Applicant: STMICROELECTRONICS SA ,  STMICROELECTRONICS (GRENOBLE 2) SAS

Inventor： Franck Montaudon ,  Julien Goulier

IPC: G06K19/077

CPC classification number: G06K19/07773

Abstract: In an embodiment an electronic device includes a first electronic circuit having a capacitive element with a variable capacitance, wherein the first electronic circuit is configured to couple the capacitive element to an antenna, to measure, by successive iterations, a first analog signal representative of a variation of an instantaneous electric power received by the antenna or representative of the instantaneous electric power received by the antenna and to modify the capacitance of the capacitive element until an amplitude of the instantaneous electric power received by the antenna is a maximum, wherein the antenna is configured to capture an amplitude-modulated electromagnetic field.