公开(公告)号：US20250105875A1

公开(公告)日：2025-03-27

申请号：US18886196

申请日：2024-09-16

Applicant: STMicroelectronics International N.V.

Inventor： Marc HOUDEBINE ,  Sylvain MAJCHERCZAK ,  Florent SIBILLE

IPC: H04B5/20 ,  H04B5/48

Abstract: A device of contactless communication by active load modulation includes a receive circuit configured to receive as an input a reception signal originating from an electromagnetic field intended to be received by an antenna and to deliver as an output a first clock signal. A transmit circuit includes an output coupled to the antenna and operates to deliver on its output a modulation signal in phase with the reception signal. A compensation circuit is configured to compensate for a first delay of the first clock signal due to the receive circuit and to the amplitude of the reception signal. The compensation circuit operates to determine a phase-shift value to be applied to an input signal of the transmit circuit to compensate for the first delay.

公开(公告)号：US20250096847A1

公开(公告)日：2025-03-20

申请号：US18882469

申请日：2024-09-11

Applicant: STMicroelectronics International N.V.

Inventor： Florent BARTHELEMY ,  Marc HOUDEBINE ,  Laurent Jean GARCIA

IPC: H04B5/48 ,  H03L7/08 ,  H04B5/77

Abstract: A device of contactless communication by active load modulation includes a clock signal extraction circuit configured to receive as an input a reception signal and to output a clock signal having a first value when the reception signal is greater than a threshold of the clock signal extraction circuit and having a second value when the reception signal is smaller than the threshold. The device includes a circuit for modifying the value of the threshold, configured to decrease the value of the threshold when the value of the clock signal is equal to the first value, or to increase the value of the threshold when the value of the clock signal is equal to the second value.

公开(公告)号：US20250105999A1

公开(公告)日：2025-03-27

申请号：US18886470

申请日：2024-09-16

Applicant: STMicroelectronics International N.V.

Inventor： Marc HOUDEBINE ,  Bruno LEDUC ,  Florent SIBILLE

IPC: H04L7/00 ,  G06K19/07 ,  H04B5/77

Abstract: A device of contactless communication by active load modulation includes a receive circuit configured to receive as an input a reception signal originating from a magnetic field intended to be received by an antenna. A transmit circuit has an output coupled to the antenna with a modulation signal in phase with the reception signal intended to be delivered thereon. A circuit compensates for a delay of the modulation signal due to the transmit circuit and to the amplitude of the reception signal. The compensation circuit determines a phase-shift value to be applied to an input signal of the transmit circuit to compensate for the delay.