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The resistive-reactive class-J power amplifier mode

: Friesicke, C.; Quay, R.; Jacob, A.F.


IEEE microwave and wireless components letters 25 (2015), No.10, pp.666-668
ISSN: 1051-8207
ISSN: 1531-1309
Journal Article
Fraunhofer IAF ()
class-J; losses; power amplifier (PA)

This letter introduces a theory which considers the effect of lossy second-harmonic terminations on the voltage waveform, output power, and efficiency of power amplifiers (PAs) operated in the class-J mode. To this end, the conventional (reactive) class-J mode is extended to a resistive-reactive class-J mode with complex fundamental and second-harmonic load impedances. The theory is experimentally validated by performing on-wafer active load-pull measurements on an AlGaN/GaN HEMT power device with 0.25 mu m gate length and a total gate periphery of 6 x 200 mu m. The measured waveforms are de-embedded to the internal current-generator of the device, where they exhibit the theoretically predicted behavior.