Miniaturized thin-film magnetic field probe with high spatial resolution for LSI chip measurement

Noriaki Ando*, Norio Masuda, Naoya Tamaki, Toshihide Kuriyama, Kunio Kato, Mikiko Saito, Shinsaku Saito, Keishi Ohashi, Masahiro Yamaguchi

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

51 Citations (Scopus)


It is important to obtain the absolute value of current flowing through each power line on a chip of large-scale integrated (LSI) circuits by measurement because this current on an LSI chip is regarded as conductive noise. We have developed a thin-film magnetic field probe that has spatial resolution high enough to obtain the absolute value of high-frequency power current on an LSI chip. Spatial resolution was enhanced by miniaturizing the shielded loop coil, the detection part of the probe. The outer size of the new coil is 50 × 22 μm. In taking measurements with the new probe over a 60-μm-wide microstrip line used as a device under test (DUT), we obtained a 6-dB decrease point of 40 μm, which indicates the spatial resolution of the probe. This value is comparable to the typical width of power lines on an LSI chip, around 50 μm and is less than half that of our conventional probes, around 90 μm. In measurements with the new probe over an LSI chip, we obtained such a fine magnetic near-field distribution that the magnetic fields generated from the lines on the chip were separated. On-chip decoupling was also confirmed by using the new probe. The new probe enables direct verification of a circuit design for suppressing electromagnetic interference (EMI), while conventional coarse mapping of the magnetic near-field cannot be used to evaluate such conductive noise.

Original languageEnglish
Pages (from-to)357-362
Number of pages6
JournalIEEE International Symposium on Electromagnetic Compatibility
Publication statusPublished - 2004
Event2004 International Symposium on Electromagnetic Compatibility, EMC 2004 - Santa Clara, CA, United States
Duration: 2004 Aug 92004 Aug 13


  • Component
  • High spatial resolution
  • LSI chip
  • Magnetic near-field measurement
  • Microstrip line
  • Thin-film magnetic field probe

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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