A phase detection circuit includes a sampling signal generation circuit configured to generate a plurality of sampling signals in response to a plurality of phase change clocks having different phases and data; a charging voltage generation circuit configured to compare the plurality of sampling signals, and change a voltage level of one charging voltage between a first charging voltage and a second charging voltage; and a comparison circuit configured to compare voltage levels of the first and second charging voltages, and generate a result signal.

A phase detection circuit includes a sampling signal generation circuit configured to generate a plurality of sampling signals in response to a plurality of phase change clocks having different phases and data; a charging voltage generation circuit configured to compare the plurality of sampling signals, and change a voltage level of one charging voltage between a first charging voltage and a second charging voltage; and a comparison circuit configured to compare voltage levels of the first and second charging voltages, and generate a result signal.

An electronic circuitry is proposed. The electronic circuitry comprises a directional coupler comprising a first port configured to receive an input signal from a signal source, a second port configured to output the input signal for transmission to a load, a third port configured to output a forward signal based on the input signal, and a fourth port configured to output a reverse signal based on a reflection of the input signal received at the second port. The electronic circuitry further comprises a Time-to-Digital converter, TDC, coupled to the third port and the fourth port. The TDC is configured to determine a phase difference between the forward signal and the reverse signal.