Hybrid envelope amplifier for envelope tracking power amplifier transmitters
Document typeConference report
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Rights accessRestricted access - publisher's policy
This paper presents an envelope tracking (ET) Power Amplifier (PA) whose architecture includes an efficient Envelope Amplifier (EA) and a bandwidth reduction algorithm suitable for real time applications. The EA consists of a hybrid amplifier combining switched and linear amplification. A band- width and slew-rate reduction algorithm has been incorporated in order to allow wide-band envelope amplifications. Non-linearities introduced by the Hybrid EA (HEA) and the dynamic supply are compensated with Digital Pre-Distortion. The ET PA has been tested using 64-QAM signals and commercial devices. Results show that non-linearities produced by the HEA are compens- able and that the architecture provides efficiency improvements compared to the conventional linear EA.
CitationVizarreta, P.; Montoro, G.; Gilabert, Pere L. Hybrid envelope amplifier for envelope tracking power amplifier transmitters. A: European Microwave Week. "European Microwave Week 2012 conference proceedings". Amsterdam: Institute of Electrical and Electronics Engineers (IEEE), 2012, p. 128-131.
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