Nonlinear design technique for high-power switching-mode oscillators

Sanggeun Jeon, Almudena Suárez, David B. Rutledge

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


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
Issue number10
Publication statusPublished - 2006 Oct
Externally publishedYes


  • 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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