Nonlinear design technique for high-power switching-mode oscillators

Sanggeun Jeon, Almudena Suárez, David B. Rutledge

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

A simple nonlinear technique for the design of high-efficiency and high-power switching-mode oscillators is presented. It combines existing quasi-nonlinear methods and the use of an auxiliary generator (AG) in harmonic balance. The AG enables the oscillator optimization to achieve high output power and dc-to-RF conversion efficiency without affecting the oscillation frequency. It also imposes a sufficient drive on the transistor to enable the switching-mode operation with high efficiency. Using this AG, constant-power and constant-efficiency contour plots are traced in order to determine the optimum element values. The oscillation startup condition and the steady-state stability are analyzed with the pole-zero identification technique. The influence of the gate bias on the output power, efficiency, and stability is also investigated. A class-E oscillator is demonstrated using the proposed technique. The oscillator exhibits 75 W with 67% efficiency at 410 MHz.

Original languageEnglish
Article number1705681
Pages (from-to)3630-3639
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Volume54
Issue number10
DOIs
Publication statusPublished - 2006 Oct
Externally publishedYes

Bibliographical note

Funding Information:
Manuscript received November 3, 2005; revised March 16, 2006. This work was supported by the Lee Center for Advanced Networking, California Institute of Technology. S. Jeon and D. B. Rutledge are with the Department of Electrical Engineering, California Institute of Technology, Pasadena, CA 91125 USA (e-mail: sjeon@caltech.edu; rutledge@caltech.edu). A. Suárez is with the Communications Engineering Department, University of Cantabria, 39005 Santander, Spain (e-mail: suareza@unican.es). Color versions of Figs. 2, 6, and 13 are available online at http://ieeexplore. ieee.org. Digital Object Identifier 10.1109/TMTT.2006.882406

Keywords

  • Class-E tuning
  • High-efficiency oscillator
  • Non-linear optimization
  • Oscillation stability
  • Startup criterion

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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