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
Yan, Jonmei J.
|Permanent link:||http://hdl.handle.net/10197/8657||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||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|
|Appears in Collections:||Electrical and Electronic Engineering Research Collection|
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