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Dynamic load modulation
University of Gävle, Department of Technology and Built Environment.
2007 (English)Independent thesis Advanced level (degree of Magister), 20 points / 30 hpStudent thesis
Abstract [en]

The purpose of this master thesis was to study if the drain efficiency of power amplifiers can be maintained at power back off using a technique called load modulation.

The amplifier classes studied are E, F and D-1. The target figure was to obtain a 10 to 12 dB dynamic range of amplitude with reasonable efficiency. Studies of power amplifiers have been made to understand how power is generated. Several different load modulation networks have been evaluated. Attempts to derive design equations for the modulation networks have also been done.

The thesis work was carried out with simulations in ADS 2006. As active devices commercially available bare-die transistor models have been used. The power rating of the dies are 15 W.

A dynamic range of amplitude of over 15 dB has been achieved with drain efficiency greater than 60 percent. The peak output power is in the 40 – 45 dBm range.

Place, publisher, year, edition, pages
2007. , p. 110
Keyword [en]
load modulation, load tracking, power added efficiency, high efficiency, PA, power amplifier, switch mode, switching, dlm, lm, et, envelope tracking, modulation, load, efficiency, PAE
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:hig:diva-702Archive number: TEX070208OAI: oai:DiVA.org:hig-702DiVA, id: diva2:120287
Uppsok
teknik
Supervisors
Examiners
Available from: 2008-09-18 Created: 2008-09-18

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CiteExportLink to record
Permanent link

Direct link
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Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • sv-SE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • de-DE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf