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On the optimization and design of SiGe HBT cascode low-noise amplifiers

  • Qingqing Liang
  • , Guofu Niu
  • , John D. Cressler
  • , Stewart Taylor
  • , David L. Harame
  • Georgia Institute of Technology
  • Auburn University
  • Intel

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

This work presents a new design methodology for inductively-degenerated cascode low-noise amplifiers using advanced epitaxial-base SiGe HBTs. IIP3 and noise figure are simulated using a calibrated linear circuit analysis and Volterra series methodology as a function of the two major design variables: emitter geometry and biasing current. Analytical IIP3 expressions with/without the CB capacitance are derived and used to explain the numerical simulation results. The cancellation among individual non-linearities is maximized at a certain IC and emitter length combination, thus producing an IIP3 peak. The analytical expressions are in good agreement with the numerical simulation results, and can be used for robust circuit design.

Original languageEnglish
Pages (from-to)329-341
Number of pages13
JournalSolid-State Electronics
Volume49
Issue number3
DOIs
StatePublished - Mar 2005

Keywords

  • Cascode
  • Input third-order intercept point (IIP3)
  • LNA
  • Noise figure
  • SiGe HBTs
  • Volterra series

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