Stability analysis and stabilization of power amplifiers

Almudena Suárez, Sanggeun Jeon, David Rutledge

Research output: Contribution to specialist publicationArticle

30 Citations (Scopus)


Some of the most common instability phenomena in power amplifiers (PAs) are explained. PAs are used in wireless communications, radar, RF heating and imaging. Recently developed stability-analysis tools can be used for understanding the desired behavior, which can be efficiently predicted and corrected at the simulation stage. The techniques, based on harmonic balance, have been illustrated by means of their application to Class E/F amplifiers at 29 MHz, which exhibited self-oscillation, hysteresis, and chaos. A simplified equivalent circuit at the oscillation frequency has been derived, enabling an efficient determination of the topology and location of the required stabilization network. The circuit has been globally stabilized for all the expected values of drain-bias voltage and input power.

Original languageEnglish
Number of pages15
Specialist publicationIEEE Microwave Magazine
Publication statusPublished - 2006 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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