Integrated inductors modeling and tools for automatic selection and layout generation

Abstract

In this work we propose new equivalent circuit models for integrated inductors based on the conventional lumped element model. Automatic tools to assist the designers in selecting and automatically laying-out integrated inductors are also reported. Model development is based on measurements taken from more than 100 integrated spiral inductors designed and fabricated in a standard silicon process. We demonstrate the capacity of the proposed models to accurately predict the integrated inductor behavior in a wider frequency range than the conventional model. Our equations are coded in a set of tools that requests the desired inductance value at a determined frequency and gives back the geometry of the better inductors available in a particular technology.