Harmonically engineered and efficiency enhanced power amplifier design for P3dB/back-off applications

The paper extends the concept of waveform shaping for back-off applications which can be applied to realize power amplification sub-blocks in load modulation based power amplifiers. The proposed theory starts with deriving the intrinsic current and voltage waveforms as a function of output power bac...

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Bibliographic Details
Published in2017 IEEE MTT-S International Microwave Symposium (IMS) pp. 789 - 792
Main Authors Sharma, Tushar, Embar, R. Srinidhi, Holmes, Damon, Darraji, Ramzi, Jones, Jeff, Ghannouchi, Fadhel
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2017
Subjects
Back-off
Gain
Gallium nitride
Harmonic analysis
high efficiency
Impedance
inverse class F (F −1 )
P3 dB
power amplifier (PA)
Power amplifiers
Power generation
Power system harmonics
waveform engineering
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Summary:The paper extends the concept of waveform shaping for back-off applications which can be applied to realize power amplification sub-blocks in load modulation based power amplifiers. The proposed theory starts with deriving the intrinsic current and voltage waveforms as a function of output power back-off factor. Thereafter, a design methodology is proposed to optimize the performance of power amplifier for back-off requirements within a limit of 3 dB gain compression. For experimental validation, the implementation is carried out using a 1.95 mm gallium nitride (GaN) die. The single-ended PA is designed to operate as a carrier PA in a 35 dBm average asymmetric Doherty configuration (44 dBm peak power). The PA exhibits a drain efficiency of 78% at an average output power of 35 dBm at a frequency of 2.6 GHz.
DOI:10.1109/MWSYM.2017.8058696