Digitally-Assisted Dual-Switch High Efficiency Envelope Amplifier for Envelope Tracking Base-Station Power Amplifiers

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Title: Digitally-Assisted Dual-Switch High Efficiency Envelope Amplifier for Envelope Tracking Base-Station Power Amplifiers
Authors: Hsia, Chin
Zhu, Anding
Yan, Jonmei J.
et al.
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Date: Nov-2011
Abstract: This paper presents a novel digitally assisted dual-switch envelope amplifier used for wideband high-efficiency envelope-tracking (ET) base-station power amplifiers (PAs). The proposed envelope amplifier comprises two switching buck converters to provide the high-power ET signal to the RF stage and a wideband linear stage to maintain the envelope signal accuracy. The control technique utilizes digital signal processing in conjunction with analog hysteretic feedback to separately control two high-efficiency switchers and thus successfully reduces power consumption of the linear stage, especially for applications requiring high peak-to-average ratio (PAPR) signals. The overall ET system was demonstrated using GaAs high-voltage HBT PAs. For a variety of signals ranging from 6.6- to 9.6-dB PAPR and up to 10-MHz RF bandwidth, the overall system power-added efficiency reached 50%-60%, with a normalized root-mean-square error below 1% and the first adjacent channel leakage power ratio of -55 dBc after digital predistortion with memory mitigation, at an average output power above 20 W and 10-dB gain.
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Microwave Theory and Techniques
Volume: 59
Issue: 11
Start page: 2943
End page: 2952
Copyright (published version): 2011 IEEE
Keywords: Dynamic supply modulatorEnvelope trackingDigital predistortionMemory effectsPeak-to-average power ratioPower amplifiers
DOI: 10.1109/TMTT.2011.2166084
Language: en
Status of Item: Peer reviewed
Appears in Collections:Electrical and Electronic Engineering Research Collection

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