Patent ID: 7300435

Claim:
A system for controlling an output of an electrosurgical generator comprising: a drive circuit for generating an output, the output being responsive to a feedback signal and operatively coupled to at least one electrode of the electrosurgical generator; at least one sensing circuit operatively coupled to the at least one electrode for generating a first signal corresponding to a value of a voltage waveform present on the at least one electrode and a second signal corresponding to a value of a current waveform present on the at least one electrode; a processing circuit for receiving the first and second signals, wherein the processing circuit implements the Goertzel algorithm for determining a phase of each of the voltage waveform and the current waveform; a determining circuit in communication with the processing circuit for generating an output signal as a function of a phase difference between the voltage waveform and the current waveform; and a control circuit for generating a feedback signal, the feedback signal representative of a difference between a value of the output signal and a reference value, the feedback signal operatively coupled to the drive circuit.