Masters Theses

Tianqi Li

Abstract

"A current probe to measure BGA ball currents via magnetic induction has been designed. The probe is manufactured on a 4 layer flex circuit and has been validated by full wave simulations and measurements. The feature size of the probe is very tiny that it almost pushes the limit of flex-circuit technology. Several critical manufacturing problems were happened, and they have been solved now. The probe allows measuring currents of a 1 mm pitch BGA ball directly. Its operating frequency stretched from tens of MHz up to 3GHz. The BGA probe's mutual inductance is approximately 11 pH, and with amplifiers the signal is large enough to be visible in real time on an oscilloscope. Moreover, a frequency-domain-calibration program has been developed to correct the measured data. And a FPGA DUT board is designed and manufactured, to demonstrate the application of the BGA probe. ADS model is also developed to show the principle of how the probe works"--Abstract, page iii.

Advisor(s)

Pommerenke, David

Committee Member(s)

Beetner, Daryl G.
Fan, Jun, 1971-

Department(s)

Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2011

Pagination

ix, 55 pages

Rights

© 2011 Tianqi Li, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Ball grid array technologyMagnetic induction

Thesis Number

T 9934

Print OCLC #

795526662

Electronic OCLC #

801842000

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