Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Optimized Design of Low Voltage High Current Ferrite Planar Inductor for 10 MHz On-chip Power Module

  • Bae, Seok (Department of Electrical and Computer Engineering, University of Alabama) ;
  • Hong, Yang-Ki (Department of Electrical and Computer Engineering, University of Alabama) ;
  • Lee, Jae-Jin (Department of Electrical and Computer Engineering, University of Alabama) ;
  • Abo, Gavin (Department of Electrical and Computer Engineering, University of Alabama) ;
  • Jalli, Jeevan (Department of Electrical and Computer Engineering, University of Alabama) ;
  • Lyle, Andrew (Department of Electrical and Computer Engineering, University of Alabama) ;
  • Han, Hong-Mei (Department of Electrical and Computer Engineering, University of Alabama) ;
  • Donohoe, Gregory W. (Department of Electrical and Computer Engineering, University of Idaho)
  • Published : 2008.06.30
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Abstract

In this paper, design parameters of high Q (> 50), high current inductor for on-chip power module were optimized by 4 Xs 3 Ys DOE (Design of Experiment). Coil spacing, coil thickness, ferrite thickness, and permeability were assigned to Xs, and inductance (L) and Q factor at 10 MHz, and resonance frequency ($f_r$) were determined Ys. Effects of each X on the Ys were demonstrated and explained using known inductor theory. Multiple response optimizations were accomplished by three derived regression equations on the Ys. As a result, L of 125 nH, Q factor of 197.5, and $f_r$ of 316.3 MHz were obtained with coil space of $127\;{\mu}m$, Cu thickness of $67.8\;{\mu}m$, ferrite thickness of $130.3\;{\mu}m$, and permeability 156.5. Loss tan ${\delta}=0$ was assumed for the estimation. Accordingly, Q factor of about 60 is expected at tan ${\delta}=0.02$.

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References

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