Power-Combining Class-E Amplifier With Finite Choke

M Thian, V Fusco, Peter Gardner

Research output: Contribution to journalArticle

14 Citations (Scopus)


A recently introduced power-combining scheme for a Class-E amplifier is, for the first time, experimentally validated in this paper. A small value choke of 2.2 nH was used to substitute for the massive dc-feed inductance required in the classic Class-E circuit. The power-combining amplifier presented, which operates from a 3.2-V dc supply voltage, is shown to be able to deliver a 24-dBm output power and a 9.5-dB gain, with 64% drain efficiency and 57% power-added efficiency at 2.4 GHz. The power amplifier exhibits a 350-MHz bandwidth within which a drain efficiency that is better than 60% and an output power that is higher than 22 dBm were measured. In addition, by adopting three-harmonic termination strategy, excellent second-and third-harmonic suppression levels of 50 and 46 dBc, respectively, were obtained. The complete design cycle from analysis through fabrication to characterization is explained.
Original languageEnglish
Pages (from-to)451-457
Number of pages7
JournalIEEE transactions on circuits and systems. I, Regular papers : a publication of the IEEE Circuits and Systems Society
Issue number3
Publication statusPublished - 1 Mar 2011


  • Class-E
  • Balun
  • transistor circuits
  • harmonic suppression
  • power amplifier (PA)
  • power combiner
  • high efficiency
  • transformer
  • switching amplifier
  • finite choke
  • transmission line


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