Quantitative estimation for electromagnetic field noise from PCB with switching transistor

Takashi Kasuga, Hiroshi Inoue

    Research output: Contribution to journalConference articlepeer-review


    To estimate the electromagnetic noise by low frequency switching operation, the spatial distributions of the electric and magnetic field around PCB with switching transistor are calculated by FDTD method implemented the switching transistor and measured. The size of the PCB is 225 mm long, 60mm wide and 0.51mm thick. The switching transistor (2SC2671) is operated by 3MHz clock pulse. The simulated and measured results of the distribution on the PCB are good agreement. Even if the output impedance of the switching transistor is varied by switching operation, the standing wave on the PCB is observed. The spatial distribution in the y-direction into the 15cm from the PCB is not uniform due to the resonance of the signal line. From the quantitative estimation of the electromagnetic noise radiation by switching operation, the electromagnetic noise by switching operation is dominant to low impedance at on state. The noise radiation when the switching transistor turned ON from OFF is problem.

    Original languageEnglish
    Pages (from-to)465-470
    Number of pages6
    JournalIEEE International Symposium on Electromagnetic Compatibility
    Publication statusPublished - 2003 Oct 20
    Event2003 IEEE Symposium on Electromagnetic Compatibility - Boston, MA, United States
    Duration: 2003 Aug 182003 Aug 22


    • Electromagnetic field distribution
    • FDTD method
    • PCB
    • Switching transistor

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Condensed Matter Physics


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