Device and method for synchronizing a high frequency power signal and an external reference signal

A device for synchronizing a periodic high frequency power signal and an external reference signal, comprising:

• a phase control circuit;
• a digital oscillator circuit connected to the phase control circuit and comprising means for generating the periodic high frequency power signal dependent on a control signal from the phase control circuit, and wherein the phase control circuit is configured to determine a phase difference of the periodic high frequency power signal and the external reference signal;
• and
• a signal processing circuit connected to the phase control circuit and comprising means for determining a phase difference of the periodic high frequency power signal and the external reference signal, and wherein the phase control circuit comprises a first counter and a second counter.