Analysis of the Second Harmonic Effect on Power Amplifier Intermodulation Products

Ayman Barakat, Mury Thian, Vincent Fusco

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

3 Citations (Scopus)
3556 Downloads (Pure)


A theoretical analysis is reported in this paper to investigate the effect that a second harmonic signal which might be present at an amplifier’s input has on generating additional intermodulation products, particularly the third-order intermodulation (IM3) products. The analysis shows that the amplitude of an extra generated IM3 component is equal to the product of the fundamental amplitude, the second harmonic amplitude, and the second order Taylor series coefficient. The effect of the second order harmonic on the IM3 is examined through a simulated example of a 2.22-GHz 10-W Class-EF amplifier whereby the IM3 levels have been reduced by 2-3 dB after employing a second harmonic termination stub at the input.
Original languageEnglish
Title of host publication2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Print)978-1-5090-0431-7
Publication statusPublished - Nov 2015
EventInternational Microwave and Optoelectronics Conference (IMOC 2015) - Porto de Galinhas/Pernambuco, Brazil
Duration: 03 Nov 201506 Nov 2015 (Link to conference details online)


ConferenceInternational Microwave and Optoelectronics Conference (IMOC 2015)
CityPorto de Galinhas/Pernambuco
Internet address


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