Radio-frequency generator for powering an ablation device

A method of ablating tissue, comprising:

• positioning an RF ablation device into contact with target tissue to be ablated, wherein the RF ablation device includes an applicator head comprising a plurality of flextures, whereby the RF ablation device determines at least one dimension of a target area of the tissue by transducing physical distance separation of at least two of the flextures of the RF ablation device;
• receiving the at least one dimension to an RF generator system operable to output any of a plurality of RF power levels, the RF generator operable to select an appropriate RF power level output to the RF ablation device based on the at least one dimension;
• wherein the RF generator automatically selects between a low-impedance transformation circuit and a high-impedance transformation circuit;
• and
• receiving an RF signal at the selected RF power to the RF ablation device for use in ablating the target area of the tissue.