Electronic device performing high-speed power line communication and operating method thereof

A communication system comprising:

• an external device including a near field communication circuit configured to perform near field communication with a mobile device and an electronic device;
• the electronic device comprising:
• a power line communication circuit configured to perform low-speed power line communication and high-speed power line communication;
• and
• a processor configured to control the power line communication circuit and the near field communication circuit,
• wherein the processor is further configured to:
• transmit, using the low-speed power line communication, a start signal instructing an initiation of high-speed communication, the start signal having been received from the mobile device;
• identify whether a communication mode of the electronic device has switched from a low-speed communication mode to a high-speed communication mode, and
• based on identifying that the communication mode of the electronic device has switched to the high-speed communication mode, transmit, using the high-speed power line communication, data received from the mobile device.

A method of performing high-speed power line communication by an electronic device, the method comprising:

• based on receiving a start signal instructing an initiation of the high-speed power line communication, blocking an electrical connection between a regulator output node and a first output node of a power line communication circuit within the electronic device;
• and
• after the blocking the electrical connection between the regulator output node and the first output node, performing the high-speed power line communication with an external device by:
• electrically coupling a pull-up resistor of the power line communication circuit, and
• coupling the first output node to a power supply voltage through the pull-up resistor or coupling the first output node to a ground voltage through the pull-up resistor, based on a logic level of input data of the power line communication circuit.