Samsung Electronics Co., Ltd.

Il Jong Song

Jong Pil Cho

Sang Hyo Lee

Chol Su Yoon

Hyoung Hwan Roh

Jun Ho Kim

Chan Su Kim

Young Joo Lee

Jae Hun Choi

In Hyuk Kim

Hang Seok Choi

Seong Sik Myoung

June Soo Kim

A near field communication (NFC) device includes a communications module and a controller. The communications module includes a receiver to receive a wireless signal, a transmitter to transmit data by superimposing the data on the wireless signal, and a signal detector to compare the wireless signal with a predetermined reference signal. The communications module operates in at least one of a wakeup mode and a sleep mode, the receiver and transmitter are activated to operate in wakeup mode, and the receiver and transmitter are deactivated in sleep mode. The controller adjusts the sensitivity of the signal detector based on a magnitude of the wireless signal and an operating condition of the communications module when the communications module enters the wakeup mode from the sleep mode.

Near field communication device

A semiconductor device is provided. The semiconductor device includes a first coil section that receives a first clock signal from a reader, a power generator that is electrically connected to the first coil section in accordance with a switching operation of a switch, a first near-field communication (NFC) chip that is electrically connected to the power generator and receives electric power in accordance with the first clock signal, a second NFC chip that generates a switching operation control signal for controlling the switching operation of the switch, and a second coil section that is electrically connected to the second NFC chip and receives a second clock signal from the reader.

Semiconductor device for near-field communication

A near field communications (NFC) device includes a receiving module and a transmitting module. The receiving module includes a receiver receiving an analog signal that includes a carrier signal and data, an analog-to-digital converter converting the analog signal to a digital signal, and a filter filtering the digital signal. The transmitting module includes a direct current-direct current (DC-DC) converter having an operating frequency belonging to a stop band of the filter, and a transmitter receiving power from the DC-DC converter and receiving a system clock signal.

Near field communications device

A transmitter of a NFC device includes a current detector which detects a first current flowing in an output node of a regulator and outputs a current detection signal related to a result of the detection, and a control block which compares the current detection signal with a reference current and generates a control signal for controlling a voltage of the output node according to a result of the comparison.

Voltage regulator with current mirroring circuitry for transmitters for near field communication (NFC) devices and chips, and electronic devices including such NFC chips

The near field communication (NFC) circuit includes an NFC reader circuit configured to communicate with an outside through an antenna, a resonant and matching circuit connected between the NFC reader circuit and the antenna, an NFC card circuit connected to nodes and configured to communicate with the outside through the antenna, and a processor configured to output a plurality of control signals when the NFC reader circuit is enabled, wherein the NFC card circuit is configured to control a resonant frequency of the antenna in response to the plurality of control signals.

Near field communication circuit and operating method of the same

A radio frequency (RF) transmission circuit includes an antenna connection terminal, a plurality of amplifiers connected to the antenna connection terminal in parallel, a plurality of drivers for driving the plurality of amplifiers, and a control circuit configured to control operation of the plurality of drivers based on information indicating a characteristic of a RF signal to be transmitted through the antenna connection terminal.

Apparatus and method for radio frequency transmission

A voltage adjusting circuit includes an inducing circuit configured to induce a voltage from electromagnetic waves, a first rectifying circuit configured to rectify an output signal of the inducing circuit, a second rectifying circuit configured to rectify the output signal of the inducing circuit, a first regulator configured to regulate an output signal of the first rectifying circuit, and a second regulator configured to regulate an output signal of the second rectifying circuit.

Voltage adjusting circuit and contactless card and contactless card system which include the same

A contactless card includes an inductive circuit configured to send and receive signals, a rectifier circuit coupled to the inductive circuit and configured to generate a DC voltage from an AC voltage generated by the inductive circuit, a clamp circuit configured to limit the DC voltage, a regulator circuit configured to regulate the DC voltage and a control circuit configured to selectively enable and disable the clamp circuit and the regulator circuit.

Contactless card clamp circuits that compensate for regulator reference voltage fluctuations

A voltage adjusting circuit is provided includes an inducing circuit configured to induce a voltage from electromagnetic waves, a first rectifying circuit configured to rectify an output voltage of the inducing circuit, a control circuit configured to control an output voltage of the first rectifying circuit in response to the output voltage of the first rectifying circuit, and a second rectifying circuit configured to simultaneously rectify and regulate the output voltage of the inducing circuit in response to the output voltage of the first rectifying circuit.

Voltage adjusting circuit, contactless card and contactless card system having the same, and methods of operating the voltage adjusting circuit and the contactless card

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Suwon-si, South Korea

Il Jong Song