Skip to main content

Modified Polar Sigma-Delta Transmitter for Multiradio Applications

Abstract

Radio transmitters capable of transforming variable envelope signals into constant envelope signals can be associated with high-efficiency switched mode power amplifiers. One of the techniques providing this conversion is Polar Sigma-Delta () architecture. This approach provides efficient solution for high-dynamic signals, and, moreover, it offers flexibility in a multiradio environment. The overall concept of the polar transmitter is presented here along with novel modifications and improvements. Namely, when recombining the envelope and the phase signals, it is suggested to replace the analog mixing by a digital mixing. The impact of a frequency synthesizer with a switched loop bandwidth and its imperfections on the overall polar architecture is investigated as well. The Mobile WiMAX standard has been chosen for validation due to very high requirements in terms of power dynamics and the variable channel bandwidth. Simulation results are presented in this paper, and advantages and drawbacks of this novel approach are pointed here as well.

Publisher note

To access the full article, please see PDF.

Author information

Affiliations

Authors

Corresponding author

Correspondence to Václav Valenta.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Suarez Penaloza, M., Valenta, V., Baudoin, G. et al. Modified Polar Sigma-Delta Transmitter for Multiradio Applications. J Wireless Com Network 2010, 979120 (2010). https://doi.org/10.1155/2010/979120

Download citation

Keywords

  • Information System
  • System Application
  • Modify Polar
  • Full Article
  • Publisher Note