Envelope amplifier based on switching capacitors for high efficiency RF amplifiers

Vasic, Miroslav; García Suárez, Oscar; Oliver Ramírez, Jesús Angel; Alou Cervera, Pedro; Díaz López, Daniel; Prieto López, Roberto y Cobos Márquez, José Antonio (2012). Envelope amplifier based on switching capacitors for high efficiency RF amplifiers. "IEEE Transactions on Power Electronics", v. 27 (n. 3); pp. 1359-1368. ISSN 0885-8993. https://doi.org/10.1109/TPEL.2011.2163646.

Descripción

Título: Envelope amplifier based on switching capacitors for high efficiency RF amplifiers
Autor/es:
  • Vasic, Miroslav
  • García Suárez, Oscar
  • Oliver Ramírez, Jesús Angel
  • Alou Cervera, Pedro
  • Díaz López, Daniel
  • Prieto López, Roberto
  • Cobos Márquez, José Antonio
Tipo de Documento: Artículo
Título de Revista/Publicación: IEEE Transactions on Power Electronics
Fecha: Marzo 2012
Volumen: 27
Materias:
Escuela: E.T.S.I. Industriales (UPM)
Departamento: Automática, Ingeniería Electrónica e Informática Industrial [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Modern transmitters usually have to amplify and transmit signals with simultaneous envelope and phase modulation. Due to this property of the transmitted signal, linear power amplifiers (class A, B, or AB) are usually used as a solution for the power amplifier stage. These amplifiers have high linearity, but suffer from low efficiency when the transmitted signal has high peak-to-average power ratio. The Kahn envelope elimination and restoration technique is used to enhance the efficiency of RF transmitters, by combining highly efficient, nonlinear RF amplifier (class E) with a highly efficient envelope amplifier in order to obtain a linear and highly efficient RF amplifier. This paper presents a solution for the envelope amplifier based on a multilevel converter in series with a linear regulator. The multilevel converter is implemented by employing voltage dividers based on switching capacitors. The implemented envelope amplifier can reproduce any signal with a maximum spectral component of 2 MHz and give instantaneous maximum power of 50 W. The efficiency measurements show that when the signals with low average value are transmitted, the implemented prototypes have up to 20% higher efficiency than linear regulators used as a conventional solution.

Más información

ID de Registro: 15953
Identificador DC: http://oa.upm.es/15953/
Identificador OAI: oai:oa.upm.es:15953
Identificador DOI: 10.1109/TPEL.2011.2163646
URL Oficial: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5975225&tag=1
Depositado por: Memoria Investigacion
Depositado el: 17 Dic 2013 17:53
Ultima Modificación: 21 Abr 2016 16:16
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