Digital signal processing methods in a novel flip chip solder joint quality inspection system are presented. Laser ultrasound and interferometric system is a new approach for solder joint inspection. It has many advantages such as being noncontact, nondestructive, fast, accurate and low cost. Furthermore, it can be used on-line in assembly line or off-line during process development. In this system, signals recorded are ultrasound waveforms. Because noise is present, signal processing methods are developed to increase signal-to-noise ratio, and to extract solder joint quality information from those waveforms. Signals are analyzed both in frequency domain and time domain. In the frequency domain, digital filtering and Bartlett power spectrum estimation method are used, and defects can be detected from the frequency shifting. A series of experimental results are presented, showing that power spectrum estimation can greatly increase the signal-to-noise ratio than when only time domain averaging is used. This speeds up the data acquisition and analysis process. In the time domain, “error ratio” is used to measure the difference between a good chip and a chip with defect. Results indicate that error ratio method not only can detect whether a chip has solder joint defect or not, but can also locate that defect. Overall, signal processing plays a very important role in this flip chip quality inspection system.
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e-mail: charles.ume@me.gatech.edu
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March 2003
Technical Papers
Digital Signal Processing in a Novel Flip Chip Solder Joint Defects Inspection System
Sheng Liu,
Sheng Liu
School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
Search for other works by this author on:
I. Charles Ume, Mem. ASME
e-mail: charles.ume@me.gatech.edu
I. Charles Ume, Mem. ASME
School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
11
Search for other works by this author on:
Sheng Liu
School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
I. Charles Ume, Mem. ASME
11
School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
e-mail: charles.ume@me.gatech.edu
Contributed by the Electronic and Photonic Packaging Division for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received by the EPPD Division, December 3, 2001. Associate Editor: Y.-H. Pao.
J. Electron. Packag. Mar 2003, 125(1): 39-43 (5 pages)
Published Online: March 14, 2003
Article history
Received:
December 3, 2001
Online:
March 14, 2003
Citation
Liu , S., and Ume, I. C. (March 14, 2003). "Digital Signal Processing in a Novel Flip Chip Solder Joint Defects Inspection System ." ASME. J. Electron. Packag. March 2003; 125(1): 39–43. https://doi.org/10.1115/1.1525820
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