In an embodiment of the invention an apparatus for power measurement in an electro-surgical instrument is disclosed. The apparatus includes: sensors, a first summer and differencer, a peak detector, a second summer and differencer, and a multiplier. The sensors produce a voltage signal and a current...http://www.google.ca/patents/US6228079?utm_source=gb-gplus-sharePatent US6228079 - Method and apparatus for power measurement in radio frequency electro-surgical generators
