An Adaptive Phase Alignment Algorithm for Cartesian Feedback Loops

Gimeno Martín, Alejandro and Pardo Martin, José Manuel and Ortega González, Francisco Javier (2010). An Adaptive Phase Alignment Algorithm for Cartesian Feedback Loops. "IEEE Signal Processing Magazine", v. 27 (n. 1); pp. 116-119. ISSN 1053-5888. https://doi.org/10.1109/MSP.2009.934923.

Description

Title: An Adaptive Phase Alignment Algorithm for Cartesian Feedback Loops
Author/s:
  • Gimeno Martín, Alejandro
  • Pardo Martin, José Manuel
  • Ortega González, Francisco Javier
Item Type: Article
Título de Revista/Publicación: IEEE Signal Processing Magazine
Date: January 2010
ISSN: 1053-5888
Volume: 27
Subjects:
Faculty: E.U.I.T. Telecomunicación (UPM)
Department: Ingeniería Audiovisual y Comunicaciones [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

An adaptive algorithm to correct phase misalignments in Cartesian feedback linearization loops for power amplifiers has been presented. It yields an error smaller than 0.035 rad between forward and feedback loop signals once convergence is reached. Because this algorithm enables a feedback system to process forward and feedback samples belonging to almost the same algorithm iteration, it is suitable to improve the performance not only of power amplifiers but also any other digital feedback system for communications systems and circuits such as all digital phase locked loops. Synchronizing forward and feedback paths of Cartesian feedback loops takes a small period of time after the system starts up. The phase alignment algorithm needs to converge before the feedback Cartesian loop can start its ideal behavior. However, once the steady state is reached, both paths can be considered synchronized, and the Cartesian feedback loop will only depend on the loop parameters (open-loop gain, loop bandwidth, etc.). It means that the linearization process will also depend only on these parameters since the misalignment effect disappears. Therefore, this algorithm relieves the power amplifier linearizer circuit design of any task required for solving phase misalignment effects inherent to Cartesian feedback systems. Furthermore, when a feedback Cartesian loop has to be designed, the designer can consider that forward and feedback paths are synchronized, since the phase alignment algorithm will do this task. This will reduce the simulation complexity. Then, all efforts are applied to determining the suitable loop parameters that will make the linearization process more efficient.

More information

Item ID: 6925
DC Identifier: http://oa.upm.es/6925/
OAI Identifier: oai:oa.upm.es:6925
DOI: 10.1109/MSP.2009.934923
Official URL: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5355502&tag=1
Deposited by: Memoria Investigacion
Deposited on: 11 May 2011 10:00
Last Modified: 20 Apr 2016 16:02
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