Systems and methods for multifrequency cable compensation

An electrosurgical generator comprising:

• an output stage configured to generate energy;
• an electrosurgical cable configured to transmit the generated energy to tissue for treating tissue;
• a voltage sensor configured to sense a voltage waveform of the generated energy at the output stage;
• a current sensor configured to sense a current waveform of the generated energy at the output stage;
• a first medium-band filter configured to pass the sensed voltage waveform having at least one frequency within a first medium-band range of frequencies including a harmonic frequency;
• a second medium-band filter configured to pass the sensed current waveform having at least one frequency within the first medium-band range of frequencies including the harmonic frequency;
• a first narrowband filter configured to obtain narrowband phase and magnitude values of at least one frequency of the sensed voltage waveform within the first medium-band range of frequencies;
• and
• a second narrowband filter configured to obtain narrowband phase and magnitude values of at least one frequency of the sensed current waveform within the first medium-band range of frequencies;
• and
• a signal processor configured to:
• determine medium-band root-mean-square (RMS) voltage and current values based on the sensed voltage and current waveforms filtered by the first and second medium-band filters;
• estimate impedance of the tissue based on the narrowband magnitude and phase and the medium-band RMS voltage and current values;
• and
• generate a control signal to control the output stage to generate energy based on the estimated impedance of the tissue.