This article presents a new equivalent circuit modeling methodology for circular‐type spiral inductors in printed circuit board. The N‐turn circular spiral inductor can be decomposed into an N‐π equivalent circuit model, and each π model is comprised of a series inductor, series capacitor, and two shunt capacitors. Both the inductance and capacitance of the equivalent circuit are calculated by the proposed formulas, which are based on the electromagnetic theory. It has been demonstrated that the proposed equivalent circuit model of the spiral inductor is well matched in S‐parameters as well as inductance values within 6% tolerance with measurement and electromagnetic field solver simulation. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:337–340, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27287

Abstract-In this paper, small dual layer spirals with several various ground structure are applied in the vicinity of the DDR3 high-speed circuit to achieve noise suppression characteristics up to 3.2 GHz region. For wider noise suppression bandwidth, the dual layer spirals with various ground structure, which provide high self resonance frequency (SRF) as well as inductance value, are implemented. The proposed dual layer spiral with various ground clearance dimension exhibits greater than 9 dB power noise suppression characteristics in the frequency range of interests and achieve about 50% voltage fluctuation reduction in time domain compare to the reference case model. To validate the effectiveness of the proposed model, sample PCB are fabricated and measured. It shows good agreement between the measured and simulated results up to 3.2 GHz.

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