公开(公告)号：US11928539B2

公开(公告)日：2024-03-12

申请号：US18111014

申请日：2023-02-17

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Kyeongdo Kim ,  Sanghyo Lee ,  Seungwon Lee ,  Jongpil Cho

IPC: G06K19/077 ,  G06K19/07 ,  H02M1/08 ,  H02M1/00 ,  H02M3/156 ,  H02M7/06

CPC classification number: G06K19/07773 ,  G06K19/0715 ,  H02M1/08 ,  H02M1/0045 ,  H02M3/156 ,  H02M7/06

Abstract: A smart card includes an antenna to transmit and to receive a radio frequency signal, a rectifier to rectify a signal received through the antenna to output a rectified voltage, a voltage regulator to operate in a first operation mode for stabilizing a level of the rectified voltage and a second operation mode for generating an internal voltage using the rectified voltage, a regulator converter to control the voltage regulator to operate the voltage regulator in one of the first operation and the second operation according to a mode selection signal, a clamp circuit to connect an output terminal of the rectifier to a ground according to the mode selection signal, a load modulator to vary a resistance of the antenna to perform a load modulation, and a regulator controller to generate the mode selection signal according to whether the load modulator is activated or deactivated.

公开(公告)号：US11055598B2

公开(公告)日：2021-07-06

申请号：US16233886

申请日：2018-12-27

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Kyeongdo Kim ,  Sanghyo Lee ,  Seungwon Lee ,  Jongpil Cho

IPC: G06K19/077 ,  G06K19/07 ,  H02M1/08 ,  H02M3/156 ,  H02M1/00 ,  H02M7/06

Abstract: A smart card includes an antenna to transmit and to receive a radio frequency signal, a rectifier to rectify a signal received through the antenna to output a rectified voltage, a voltage regulator to operate in a first operation mode for stabilizing a level of the rectified voltage and a second operation mode for generating an internal voltage using the rectified voltage, a regulator converter to control the voltage regulator to operate the voltage regulator in one of the first operation and the second operation according to a mode selection signal, a clamp circuit to connect an output terminal of the rectifier to a ground according to the mode selection signal, a load modulator to vary a resistance of the antenna to perform a load modulation, and a regulator controller to generate the mode selection signal according to whether the load modulator is activated or deactivated.

公开(公告)号：US12040828B2

公开(公告)日：2024-07-16

申请号：US17708408

申请日：2022-03-30

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Minchul Kang ,  Sanghyo Lee ,  Kyeongdo Kim ,  Inhyuk Kim

IPC: H04L5/16 ,  H02J50/80 ,  H03H7/06 ,  H03H7/38 ,  H04B1/10 ,  H04B1/40

CPC classification number: H04B1/40 ,  H02J50/80 ,  H03H7/06 ,  H03H7/38 ,  H04B1/1018

Abstract: A communication device is provided. The communication device includes: an antenna; a matching circuit connected with the antenna; a transmitter configured to generate a transmission communication signal and provide the transmission communication signal to the antenna through the matching circuit; a filter connected between the matching circuit and the antenna; and a receiver configured to receive an attenuated signal from the antenna through the filter. The filter is configured to pass frequencies of an antenna signal corresponding to a pass band and attenuate frequencies of the antenna signal corresponding to a stop band, and a center frequency of the transmission communication signal corresponds to the stop band of the filter.

公开(公告)号：US11586873B2

公开(公告)日：2023-02-21

申请号：US17366908

申请日：2021-07-02

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Kyeongdo Kim ,  Sanghyo Lee ,  Seungwon Lee ,  Jongpil Cho

IPC: G06K19/077 ,  G06K19/07 ,  H02M1/08 ,  H02M3/156 ,  H02M7/06 ,  H02M1/00

Abstract: A smart card includes an antenna to transmit and to receive a radio frequency signal, a rectifier to rectify a signal received through the antenna to output a rectified voltage, a voltage regulator to operate in a first operation mode for stabilizing a level of the rectified voltage and a second operation mode for generating an internal voltage using the rectified voltage, a regulator converter to control the voltage regulator to operate the voltage regulator in one of the first operation and the second operation according to a mode selection signal, a clamp circuit to connect an output terminal of the rectifier to a ground according to the mode selection signal, a load modulator to vary a resistance of the antenna to perform a load modulation, and a regulator controller to generate the mode selection signal according to whether the load modulator is activated or deactivated.

公开(公告)号：US11411610B2

公开(公告)日：2022-08-09

申请号：US16991666

申请日：2020-08-12

Applicant: Samsung Electronics Co., Ltd.

Inventor： Youngseok Kim ,  Sanghyo Lee

IPC: H04B5/00

Abstract: A near field communication (NFC) device includes a resonator including an antenna and a matching circuit, a transmitter and a frequency detector. The transmitter generates a sensing voltage signal at the resonator. With respect to a plurality of measurement periods where each measurement period includes a turn-on period and a turn-off period, the transmitter is enabled to output a radio frequency (RF) signal to the resonator during the turn-on period and disabled during the turn-off period. The frequency detector detects a resonance frequency of the resonator based on the sensing voltage signal. The resonance frequency is accurately detected by measuring the resonance frequency during the plurality of measurement periods. In addition, the resonance frequency is efficiently detected by generating the sensing voltage signal using the transmitter established in the NFC device.