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. | Permanent link: | http://hdl.handle.net/10197/8657 | Date: | Nov-2011 | Online since: | 2017-07-14T11:50:21Z | 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. | Funding Details: | University of California Discovery Grant Program Nokia Siemens Networks |
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 modulator; Envelope tracking; Digital predistortion; Memory effects; Peak-to-average power ratio; Power amplifiers | DOI: | 10.1109/TMTT.2011.2166084 | Language: | en | Status of Item: | Peer reviewed | This item is made available under a Creative Commons License: | https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ |
Appears in Collections: | Electrical and Electronic Engineering Research Collection |
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