Adaptive matching with antenna detuning detection

A method comprising:

• receiving an input signal having a first phase from a transmitter;
• receiving a second signal having a second phase from a clock control circuit configured to transmit a clock signal to the transmitter;
• comparing the input signal having the first phase with the second signal having the second phase;
• generating a phase comparison signal based upon a difference in phase between the input signal having the first phase and the second signal having a second phase;
• and
• outputting a control signal having a voltage based upon the phase comparison signal to control an amount of capacitance of a variable capacitance element of an antenna tuning circuit of a communication interface.

A device, comprising:

• a transmitter configured to generate a first signal having a first phase;
• a clock control circuit configured to generate a second signal having a second phase;
• and
• a receiver comprising:
• an input configured to receive the first signal having the first phase;
• a phase comparator configured to:
• compare the first signal having the first phase with the second signal having the second phase;
• and
• generate a phase comparison signal based upon a difference in phase between the first signal having the first phase and the second signal having the second phase;
• and
• an output configured to transmit a control signal having a voltage based upon the phase comparison signal to control an amount of capacitance of a variable capacitance element of an antenna tuning circuit of a communication interface.