Envelope amplifier based on switching capacitors for high efficiency RF amplifiers

Vasic, Miroslav and García Suárez, Oscar and Oliver Ramírez, Jesús Angel and Alou Cervera, Pedro and Díaz López, Daniel and Prieto López, Roberto and 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.

Description

Title: Envelope amplifier based on switching capacitors for high efficiency RF amplifiers
Author/s:
  • Vasic, Miroslav
  • García Suárez, Oscar
  • Oliver Ramírez, Jesús Angel
  • Alou Cervera, Pedro
  • Díaz López, Daniel
  • Prieto López, Roberto
  • Cobos Márquez, José Antonio
Item Type: Article
Título de Revista/Publicación: IEEE Transactions on Power Electronics
Date: March 2012
ISSN: 0885-8993
Volume: 27
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Automática, Ingeniería Electrónica e Informática Industrial [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 15953
DC Identifier: http://oa.upm.es/15953/
OAI Identifier: oai:oa.upm.es:15953
DOI: 10.1109/TPEL.2011.2163646
Official URL: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5975225&tag=1
Deposited by: Memoria Investigacion
Deposited on: 17 Dec 2013 17:53
Last Modified: 21 Apr 2016 16:16
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