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

Shoichi OSHIMA; Mamoru UGAJIN; Mitsuru HARADA

doi:10.1587/transele.E95.C.713

IEICE Transactions on Electronics

Online ISSN : 1745-1353
Print ISSN : 0916-8524

Special Section on Solid-State Circuit Design - Architecture, Circuit, Device and Design Methodology

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

Shoichi OSHIMA, Mamoru UGAJIN, Mitsuru HARADA

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Keywords: power amplifier, distortion, linearizer, harmonics, feedback

JOURNAL RESTRICTED ACCESS

2012 Volume E95.C Issue 4 Pages 713-716

DOI https://doi.org/10.1587/transele.E95.C.713

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Abstract

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 200µW.

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