Samsung Electronics Co., Ltd.

Hang Seok Choi

Il Jong Song

Chol Su Yoon

Sang Hyo Lee

Ku Chul Jung

In Hyuk Kim

Ku Chui Jung

An electronic device includes a connector including a plurality of terminals for electrically connecting to a power supply device supplying a power to the electronic device and a control circuit. The control circuit senses a moisture entering the connector, changes an impedance of at least one specified data terminal among the terminals in response to the sensing of the moisture such that the power supply device identifies the impedance of the at least one specified data terminal and changes a level of a voltage depending on the impedance, and receives the voltage whose level is changed from the power supply device. Other various embodiments identified in the specification are also possible.

Method and apparatus for changing impedance of terminal included in connector

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

An auto gain controller is provided. The auto gain controller includes a variable gain amplification unit configured to receive differential input signals, adjust an amplification gain based on an auto gain control voltage and output differential output signals. The auto gain controller also includes a peak detector configured to detect at least one peak value among the amplified differential output signals, a comparator configured to compare the at least one detected peak value with a reference voltage and generate a comparison signal, and a voltage adjusting circuit configured to adjust the auto gain control voltage and the reference voltage based on the comparison signal.

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Suwon-si, South Korea

Hang Seok Choi