GaN HEMT based high efficiency push-pull inverse class-F power amplifier using chip-on-board technique

Jun Chul Park, Chan Sei Yoo, Wonshil Kang, Dongsu Kim, Jong Gwan Yook, Woo Sung Lee

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

7 Citations (Scopus)


This paper presents a high efficiency push-pull inverse class-F (class-F -1) power amplifier (PA) using a gallium nitride (GaN) transistor for class-S system - a digitally controlled by delta-sigma modulation. To enhance a drain efficiency of class-F -1 PA, the chip-on-board (COB) technique, which can reduce the external parasitic components of the packaged transistor and allow fast switching operation at high frequencies by minimizing distortion of the pulse waveform, is adopted. A harmonic control circuit considering output intrinsic parameters of the transistor from switch-based model controls harmonics to extract pure fundamental frequency of the output signal. For a high efficiency push-pull operation, low loss rat-race baluns are integrated at input and output circuits. From the measured results for a continuous wave of 3.3 GHz, the class-F -1 PA shows a maximum output power of 35.5 dBm and a power gain of about 10 dB. Also, the proposed PA provides a high power-added-efficiency (PAE) of 64.2% and a drain efficiency of 77.2% at maximum output power. The drain efficiency is still remained over 75% in the frequency range of 100 MHz.

Original languageEnglish
Title of host publicationAsia-Pacific Microwave Conference Proceedings, APMC 2011
Number of pages4
Publication statusPublished - 2011
EventAsia-Pacific Microwave Conference, APMC 2011 - Melbourne, VIC, Australia
Duration: 2011 Dec 52011 Dec 8

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


OtherAsia-Pacific Microwave Conference, APMC 2011
CityMelbourne, VIC

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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