Analog Integrated Circuits and Signal Processing

, Volume 65, Issue 1, pp 151–156 | Cite as

Adaptive gain and delay mismatch cancellation for LINC transmitter

  • Corinne Berland
  • Jean-François Bercher
  • Olivier Venard
Mixed Signal Letter

Abstract

Linear amplification with Nonlinear Component (LINC) transmitter architecture is an efficient solution for high efficiency amplification of signals. Nonetheless, this solution suffers both from gain impairment and delay mismatch between the two signal paths. Indeed, a mismatch in propagation time between the paths degrades the quality of the transmit signal but also disrupts the convergence of the gain correction algorithm resulting in a degradation of its performance. In this paper, we present an adaptive algorithm based on a gradient descent formulation for the identification and correction of these delays. We also demonstrate its effectiveness when applied prior to the gain adjustment procedure. The identification approach is preferred here, to ensure monitoring facilities.

Keywords

Radio transmitters Power amplifiers Adaptive signal processing Delay filters Delay estimation Nonlinear distortion 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Corinne Berland
    • 1
    • 2
  • Jean-François Bercher
    • 3
  • Olivier Venard
    • 4
  1. 1.LaMIPS, Laboratoire commun NXP-CRISMATUMR 6508 CNRS ENSICAEN UCBN. 2Caen Cedex 5France
  2. 2.Dept. Systèmes ElectroniquesESIEE ParisNoisy-Le-GrandFrance
  3. 3.Université Paris-Est, LabInfo-IGM, ESIEE Paris, Cité DescartesNoisy le GrandFrance
  4. 4.Dept TelecommunicationUniversité Paris-Est, ESIEE Paris, Cité DescartesNoisy le GrandFrance

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