Switching capacities based envelope amplifier for high efficiency RF amplifiers

Vasic, Miroslav and García Suárez, Oscar and Oliver Ramírez, Jesús Angel and Alou Cervera, Pedro and Cobos Márquez, José Antonio (2010). Switching capacities based envelope amplifier for high efficiency RF amplifiers. In: "25th Annual IEEE Applied Power Electronics Conference and Exposition (APEC)", 21/02/2010 - 25/02/2010, Palm Springs, California, EEUU. ISBN 978-1-4244-4782-4.

Description

Title: Switching capacities based envelope amplifier for high efficiency RF amplifiers
Author/s:
  • Vasic, Miroslav
  • García Suárez, Oscar
  • Oliver Ramírez, Jesús Angel
  • Alou Cervera, Pedro
  • Cobos Márquez, José Antonio
Item Type: Presentation at Congress or Conference (Article)
Event Title: 25th Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Event Dates: 21/02/2010 - 25/02/2010
Event Location: Palm Springs, California, EEUU
Title of Book: Proceedings of 25th Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Date: 2010
ISBN: 978-1-4244-4782-4
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 (PAPR). The Kahn envelope elimination and restoration (EER) technique is used to enhance efficiency of RF transmitters, by combining highly efficient, nonlinear RF amplifier (class E) with a highly efficient envelope amplifier in order to obtain 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 capacities. The implemented envelope amplifier can reproduce any signal with 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 regulator that is used as a conventional solution.

More information

Item ID: 7819
DC Identifier: http://oa.upm.es/7819/
OAI Identifier: oai:oa.upm.es:7819
Official URL: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5433590&tag=1
Deposited by: Memoria Investigacion
Deposited on: 02 Aug 2011 11:49
Last Modified: 20 Apr 2016 16:50
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