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

Vasic, Miroslav; Cheng, Pengming; García Suárez, Óscar; Oliver Ramírez, Jesús Angel; Alou Cervera, Pedro; Cobos Márquez, José Antonio; Tena Ramos, David y 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.

Descripción

Título: The design of a multilevel envelope tracking amplifier based on a multiphase buck converter
Autor/es:
  • 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
Tipo de Documento: Artículo
Título de Revista/Publicación: IEEE Transactions on Power Electronics
Fecha: Junio 2016
Volumen: 31
Materias:
Palabras Clave Informales: Envelope Tracking, Envelope Elimination and Restoration, Multilevel converter, Multiphase converter
Escuela: E.T.S.I. y Sistemas de Telecomunicación (UPM)
Departamento: Teoría de la Señal y Comunicaciones
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 41315
Identificador DC: http://oa.upm.es/41315/
Identificador OAI: oai:oa.upm.es:41315
Identificador DOI [BETA]: 10.1109/TPEL.2015.2476517
URL Oficial: http://ieeexplore.ieee.org/document/7268925/
Depositado por: Memoria Investigacion
Depositado el: 23 Mar 2017 19:05
Ultima Modificación: 23 Mar 2017 19:05
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