High-Efficiency Wilkinson-Power-Combining Class-EF Amplifier with Lumped-Element Load Network

Mury Thian

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
371 Downloads (Pure)


This paper presents a design strategy to incorporate the load network of Class-EF power amplifier (PA) into a complex-impedance-terminated Wilkinson power combiner (WPC) in order to reduce the circuit complexity and footprint. To further reduce the circuit footprint, the WPC and the Class-EF PA’s load network are designed using lumped elements as opposed to transmission lines typically employed in the classical designs. The proposed circuit provides an impedance matching from 50 Ω to a complex impedance at the fundamental frequency and a short-circuit termination at the second harmonic. The new topology exhibits a band-pass frequency response instead of low/high-pass as in the conventional WPCs, thus enabling suppression of unwanted signals at low and high frequencies. Closed-form design equations, derived using even/odd mode analysis, are given along with a design example. Driven by a 3-GHz continuous-wave input signal, the proposed PA delivers 41.5-dBm output power with DC-to-RF efficiency of 83.6% at 3.9-dB compressed gain of 15.2 dB.
Original languageEnglish
Title of host publication2018 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages199 - 202
Number of pages4
ISBN (Electronic)978-1-5386-8240-1
Publication statusPublished - 10 Jan 2019


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