Representative Frequency for Interconnect R(f)L(f)C Extraction

Akira TSUCHIYA  Masanori HASHIMOTO  Hidetoshi ONODERA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E86-A   No.12   pp.2942-2951
Publication Date: 2003/12/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Parasitics and Noise
interconnect,  extraction,  frequency-dependent,  

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This paper discusses the frequency to extract RLC values from interconnects. In circuit design, frequency-independent equivalent circuit is widely used, and many design and analysis techniques based on this equivalent circuit are proposed so far. However in reality, characteristics of interconnects are frequency-dependent. Also pulse waveforms in digital circuits contain multiple frequency components. The frequency used for RLC extraction affects the accuracy of interconnect characterization, and hence careful determination of extraction frequency is critical. We propose a representative frequency for RLC extraction. Conventionally, representative frequencies are determined by input pulse. The proposed method decides the representative frequency based on the interconnect length, whereas conventional representative frequencies are determined by input pulse shape, period and patterns. We verify that the extraction at the proposed frequency provides the most accurate transition waveform against various input signals and interconnect structures in digital circuits.