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Thermosonic ball bonding: friction model based on integrated microsensor measurements | IEEE Conference Publication | IEEE Xplore

Thermosonic ball bonding: friction model based on integrated microsensor measurements


Abstract:

A model of friction during thermosonic ball bonding is reported. The model is based on recent ultrasonic stress measurements during ball bonding using piezoresistive micr...Show More

Abstract:

A model of friction during thermosonic ball bonding is reported. The model is based on recent ultrasonic stress measurements during ball bonding using piezoresistive microsensors integrated below test bonding pads. At the bonding pad, the microsensor signal is a measure of the stress caused by periodic oscillation of the capillary and gold ball. The new model interprets the oscillation in terms of alternate periods of sticking and sliding during bond formation. The oscillation shape was examined using harmonic analysis and compared with electrical parameters from the ultrasound power supply. To further validate the model, test bonds were made on passivated test pads. The model was found to be consistent with the measurement data. Experiments were performed at temperatures between 35/spl deg/C and 200/spl deg/C.
Date of Conference: 19-19 October 1999
Date Added to IEEE Xplore: 06 August 2002
Print ISBN:0-7803-5502-4
Print ISSN: 1089-8190
Conference Location: Austin, TX, USA

References

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