The design of a multilevel envelope tracking amplifier based on a multiphase buck converter

Vasic, Miroslav and Cheng, Pengming and García Suárez, Óscar and Oliver Ramírez, Jesús Angel and Alou Cervera, Pedro and Cobos Márquez, José Antonio and Tena Ramos, David and Ortega González, Francisco Javier (2016). The design of a multilevel envelope tracking amplifier based on a multiphase buck converter. "IEEE Transactions on Power Electronics", v. 31 (n. 6); pp. 4611-4627. ISSN 0885-8993. https://doi.org/10.1109/TPEL.2015.2476517.

Description

Title: The design of a multilevel envelope tracking amplifier based on a multiphase buck converter
Author/s:
  • Vasic, Miroslav
  • Cheng, Pengming
  • García Suárez, Óscar
  • Oliver Ramírez, Jesús Angel
  • Alou Cervera, Pedro
  • Cobos Márquez, José Antonio
  • Tena Ramos, David
  • Ortega González, Francisco Javier
Item Type: Article
Título de Revista/Publicación: IEEE Transactions on Power Electronics
Date: June 2016
ISSN: 0885-8993
Volume: 31
Subjects:
Freetext Keywords: Envelope Tracking, Envelope Elimination and Restoration, Multilevel converter, Multiphase converter
Faculty: E.T.S.I. y Sistemas de Telecomunicación (UPM)
Department: Teoría de la Señal y Comunicaciones
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Envelope Tracking (ET) and Envelope Elimination and Restoration (EER) are techniques that have gained in importance in the last decade in order to obtain highly efficient Radio Frequency Power Amplifier (RFPA) that transmits signals with high Peak to Average Power Ratio (PAPR). In this work a multilevel multiphase buck converter is presented as a solution for the envelope amplifier used in ET and EER. The presented multiphase buck converter generates multilevel voltage using “node” duty cycles and non-linear control. In this way the multilevel is implemented using only one simple power stage. However, the complexity of the multilevel converter implementation has been shifted from complicated power topologies to complicated digital control. Detailed discussion regarding the influence of the design parameters (switching frequency, output filter, time resolution of the digital control) on the performance of the proposed envelope amplifier is presented. The design of the output filter is conducted fulfilling the constraints of the envelope slew rate and minimum driver pulse that can be reproduced. In the cases when these two constraints cannot be fulfilled, they may be relieved by the modified control that is presented and experimentally validated. Finally, in order to validate the concept, a prototype has been designed and integrated with a nonlinear class F amplifier. Efficiency measurements showed that by employing EER it is possible to save up to 15% of power losses, comparing to the case when it is supplied by a constant voltage. Additionally, Adjacent Channel Power Ratio (ACPR) has been measured. The obtained results showed the value higher than 30dB for signals up to 5 MHz of bandwidth, without using predistortion technique.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainTEC2012-38247-C02-01UnspecifiedUnspecifiedUnspecified

More information

Item ID: 41315
DC Identifier: http://oa.upm.es/41315/
OAI Identifier: oai:oa.upm.es:41315
DOI: 10.1109/TPEL.2015.2476517
Official URL: http://ieeexplore.ieee.org/document/7268925/
Deposited by: Memoria Investigacion
Deposited on: 23 Mar 2017 19:05
Last Modified: 10 Jun 2019 10:01
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