Digital cartesian feedback linearization of switched mode power amplifiers

Alejandro Viteri, Amir Zjajo, Thijmen Hamoen, Nick van der Meijs

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

5 Citations (Scopus)

Abstract

The efficient use of the power budget in small satellite applications is of primary importance because of the reduced size of the power sources. Unfortunately, high efficiency in power amplifiers (PA) is strongly related to non-linearities and hence distortion. In this paper a digital architecture for the linearization of switched mode PAs is proposed, and a circuit to detect the phase shift and the CORDIC algorithm to correct that phase as well as to compute the magnitude are developed. The results show that linearity is improved by 20 dB for a system with a bandwidth of 9.6 kHz for a loop gain of 10 and 400 ns of system delay. The circuit, synthesized in a FPGA consumes a total of 33.3 mW.
Original languageEnglish
Title of host publicationProceedings - 2010 IEEE International Conference on Electronics, Circuits and Systems, ICECS 2010
Place of PublicationPiscataway, NJ
PublisherIEEE
Pages890-893
Number of pages4
ISBN (Electronic)978-1-4244-8157-6
ISBN (Print)978-1-4244-8155-2
DOIs
Publication statusPublished - Dec 2010
Event2010 IEEE International Conference on Electronics, Circuits and Systems, ICECS 2010 - Divani Caravel Hotel, Athens, Greece
Duration: 12 Dec 201015 Dec 2010
Conference number: 17

Conference

Conference2010 IEEE International Conference on Electronics, Circuits and Systems, ICECS 2010
CountryGreece
CityAthens
Period12/12/1015/12/10

Keywords

  • CORDIC
  • Cartesian feedback
  • linearization
  • phase alignment

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