An electrosurgical high frequency (HF) generator for cutting and/or coagulating biological tissue. The generator comprises a power supply and a generator stage for exciting an HF oscillation signal in an output filter comprising a parallel resonant circuit coupled to a series resonant circuit, to which at least one electrode is connected. The generator has an improved efficiency level if the series resonant circuit has a resonance frequency that is higher than the resonance frequency of the parallel resonant circuit.電源供給ユニットと、並列共振回路とそれに結合した直列共振回路とを含み、少なくとも１つの電極が接続された出力フィルタにおいて高周波発振を誘起する、発生器部とを備えた、生物組織を切断および／または凝固させるための電気手術器用高周波発生器が、直列共振回路が並列共振回路の共振周波数よりも高い共振周波数を有する場合に、改善された効率水準を有する。
