A broadband and scalable lumped element model for fully symmetric inductors under single-ended and differentially driven operations

Jyh-Chyurn Guo*, Teng Yang Tan

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

A broadband and scalable 2-T model is developed to accurately simulate fully symmetric inductors with various dimensions. The 2-T model is defined to reflect the structure of an equivalent circuit with two identical T-model circuits. Two-step de-embedding is assisted by open and through pads for extraction of intrinsic characteristics. The accuracy is validated by 3-D full-wave electromagnetic simulation. A novel parameter extraction flow is established, and a single set of model parameters is derived to be valid for both single-ended and differentially driven topologies. The broadband accuracy is proven by a good match with S-parameters, L(ω), Re(Zin(ω)), and Q(ω) over frequencies up to 20 GHz. The scalability is justified by good fitting with either a linear or a parabolic function of spiral coil radii. Furthermore, all model parameters are frequency independent so as to ensure computation efficiency. This 2-T model consistently predicts the enhancement of Qmax by 20%-30% for the symmetric inductors under a differential excitation. The Q improvement is even better than 100% over broader frequencies beyond fm (Qmax).

Original languageEnglish
Pages (from-to)1878-1888
Number of pages11
JournalIEEE Transactions on Electron Devices
Volume54
Issue number8
DOIs
StatePublished - 1 Aug 2007

Keywords

  • Broadband
  • Differential
  • Inductor
  • Scalable
  • Single end
  • Symmetric

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