A system for performing an ocular surgical procedure is provided. The systemincludes a multiple frequency signalsource, a configurable tuned output filter connected to the multiple frequencysignal source, and a multiple frequency ultrasonichandpiece. The multiple frequency signal source operates at a first frequencyand is configured to drive the configurable filter andthe multiple frequency ultrasonic handpiece at the first frequency. Themultiple frequency signal source operates at a second frequencyand is configured to drive the configurable filter and the multiple frequencyultrasonic handpiece at the second frequency,and the design addresses third harmonic frequency issues for the multiplefrequency ultrasonic handpiece. Switchable passivecomponents, such as inductors, resistors, and/or capacitors may be employed inthe configurable tuned output circuit, or alternately multiplesimilar circuits may be employed. Alternately, a multi-tap transformer may beprovided.
