Power current model of LSI/IC containing equivalent internal impedance for EMI analysis of digital circuits

Yukihiro Fukumoto, Yasuo Takahata, Osami Wada, Yoshita Toyota, Takuya Miyashita, Ryuji Koga

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

This paper investigates a device model of the power current used for an LSI/IC. The model is proposed to analyze the power bus noise in digital circuit boards. This model is defined in the frequency domain and constructed with an equivalent internal impedance and an equivalent internal current source. Accordingly, the output current of the model is affected by power bus impedance, such as the capacitance of bypass capacitors and the parasitic inductance of power bus wiring. Therefore, the model is useful for analyzing the effectiveness of bypass capacitors and power bus wiring. The structure of equivalent internal impedance for a simple logic IG, such as 74HCXX, can be represented as an RLC series circuit. These parameters are identified by applying the least square method. To demonstrate the validity of the model, an experimental study was conducted. As a result, it was shown that the output current of the model corresponds to the measured current under a variety of power bus impedance levels within 6dB.

Original languageEnglish
Pages (from-to)3041-3049
Number of pages9
JournalIEICE Transactions on Communications
VolumeE84-B
Issue number11
Publication statusPublished - Nov 2001

Keywords

  • EMI
  • High-frequency current
  • LSI/IC
  • Power bus noise
  • Simulation model

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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