In ultrasonic wire bonding the required vibrations are generated by an ultrasonic transducer driven in its longitudinal mode. Asymmetries might lead to additional orthogonal motions, which lead to unwanted fluctuating normal forces in the friction contact. In this publication, a novel design of an ultrasonic transducer with control actuators is presented. The parasitic vibrations are damped by shunting the additional piezoelectric actuators by passive LR-networks. A Finite-Element model is developed to optimize the dimensions and the placement of the piezoceramics and to tune the electrical networks. Measurements are conducted on a prototype transducer which validate the simulation results.
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