Intelligent Mechanical Balancing Apparatus for Slide Screw Tuner / 9,431,999

Tuesday, August 30, 2016

An intelligent, independent and universal mechanical balancing apparatus for automatic microwave multi-probe slide screw tuners allows stable on-wafer testing of sub-micrometric devices. Low loss rigid airlines (bend-lines) used to connect the multi-probe tuner with the chips, in order to improve the tuning range at the DUT reference plane, causes mechanical movements of the wafer probes attached to the rigid bend-lines, when the tuner mobile carriages move horizontally. Stabilizing the center of gravity (balancing) of the tuner by means of exactly controlled counter-weights, driven by the same firmware which controls the tuner motors, allows for synchronized compensation of the probe movement and safe on wafer load pull operation.