Samsung Electronics Co., Ltd.

Kyeongdo Kim

Sanghyo Lee

Seungwon Lee

Jongpil Cho

Inhyuk Kim

Minhyeok Kang

Minchul Kang

A smart card may include: an antenna configured to receive at least one radio signal; a load circuit that is connected to both ends of the antenna; a rectifier configured to rectify the at least one radio signal received through the antenna, and provide the rectified signal to an output terminal; and a power generator including a voltage regulator, a first diode, and a second diode, the voltage regulator configured to provide an internal voltage, the first diode and the second diode connected in series between the output terminal of the rectifier and a first node, and the first node is configured to receive the internal voltage during a first mode of the smart card, the first mode being a mode during which a load of the load circuit is modulated.

Smart card

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.

Communication device, electronic device including communication device, and operating method of electronic device

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.

Growing community of inventors

Seoul, South Korea

Kyeongdo Kim