Input device, interface system including the same, and method of operating input device

An electronic device comprising:

• a sensor layer including a plurality of electrodes;
• a main driver configured to generate a first clock signal;
• a sensor driver configured to output a modulated signal, which includes position information, to the sensor layer, based on the first clock signal;
• and
• an input device configured to receive an input signal from the sensor layer, convert the input signal into a digital code, and recover the position information, based on the digital code,
• wherein the input device generates a second clock signal fixed to the first clock signal, based on the input signal.

A method of operating an input device, the method comprising:

• determining a target pattern, based on frequency information of an input signal received, by a pattern controller;
• detecting the target pattern from the input signal, by a pattern detector;
• comparing the target pattern detected by the pattern detector with each of a plurality of reference signals corresponding to a plurality of phases, respectively, by a pattern phase detector;
• generating phase information based on a comparison result, by the pattern phase detector;
• and
• generating a clock signal recovered based on the frequency information and the phase information, by a pattern generator.