Third-Harmonic Envelope Feedback Method for High-Efficiency Linear Power Amplifiers

Shoichi OSHIMA  Mamoru UGAJIN  Mitsuru HARADA  

IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.4   pp.713-716
Publication Date: 2012/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.713
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
power amplifier,  distortion,  linearizer,  harmonics,  feedback,  

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A new low-power feedback structure for a power amplifier (PA) reduces signal distortion while keeping the power efficiency of the PA high. The feedback structure injects the envelope of the third-order harmonics into the input signal. In adopting this method for a class-A amplifier, we obtain over 10% higher efficiency while maintaining the same adjacent channel power ratio (ACPR). The power consumption of additional circuit is 200 µW.