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Thick film resistor testing by electro — Ultrasonic spectroscopy with DC electric signal

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3 Author(s)
Pavel, T. ; Dept. of Phys., Univ. of Technol., Brno, Czech Republic ; Vlasta, S. ; Josef, S.

The new method of non-destructive testing of the thick film resistors is presented. There are two phenomena which lead to the resistance modulation: (i) The interaction of the charge carriers with phonons, (ii) The ultrasonic signal changes the contact area between the conducting grains in the resistor structure. Ultrasound-excited resistance change in polymer based thick film structures is about 0.005 Omega to 1 Omega, which corresponds to the relative resistance change of the order from 10-6. We suppose that the resistive structures with defects are more influenced by the ultrasonic vibrations. The intermodulation signal can be used as the quality and reliability indicator.

Published in:

Electronics Technology, 2008. ISSE '08. 31st International Spring Seminar on

Date of Conference:

7-11 May 2008

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