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Investigation of Push-Pull Microwave Power Amplifiers Using an Advanced Measurement Setup

Paul Saad (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum) ; Mattias Thorsell (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum) ; Kristoffer Andersson (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum) ; Christian Fager (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik ; GigaHertz Centrum)
Ieee Microwave and Wireless Components Letters (1531-1309). Vol. 23 (2013), 4, p. 220-222.
[Artikel, refereegranskad vetenskaplig]

In this letter, we investigate the influence of the output balun for realization of wideband and efficient microwave push-pull power amplifiers (PAs). For this, a push-pull GaN-HEMT PA operating between 1-3 GHz without an output balun has been implemented and a novel push-pull harmonic load-pullmeasurement setup that allows arbitrary balanced fundamental and second harmonic loads to be presented to the push-pull PA is proposed. The measurement results illustrate that the efficiency may be degraded up to 25% if improper common mode harmonic impedances are presented by the balun. The proposed approach allows the PA and balun to be investigated separately and is therefore expected to be an important tool for further research on balun and PA structures suitable for high efficiency and wideband push-pull applications at microwave frequencies.



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Denna post skapades 2013-06-10. Senast ändrad 2015-12-17.
CPL Pubid: 178124

 

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