A Class-J Power Amplifier with Varactor Based Dynamic Load Modulation

Visa enkel post
dc.contributor.authorHallberg, William
dc.contributor.departmentChalmers tekniska högskola / Institutionen för mikroteknologi och nanovetenskapsv
dc.contributor.departmentChalmers University of Technology / Department of Microtechnology and Nanoscienceen
dc.date.accessioned2019-07-03T13:24:08Z
dc.date.available2019-07-03T13:24:08Z
dc.date.issued2014
dc.description.abstractIn order to reach increasingly higher data rates and energy requirements in mobile networks, energy efficiency and broadband operation in power amplifiers have been driving parameter in the research of wireless transmitters. This thesis presents the theory for a broadband design of a dynamic load modulated class-J power amplifier. Calculations show that a drain efficiency higher than 70% down to an output power back off of 7.7 dB can be maintained for a fractional bandwidth of 36% by tuning the transistor load reactance during the appropriate operating conditions. The modulation of the transistor load reactance can, for example, be achieved with varactors. The concept is demonstrated in a gallium nitride high electron mobility transistor power amplifier with silicon carbide varactors. The power amplifier achieved a power adde iency over 50% for 1.70 to 1.80 GHz down to 5 dB output power back off, with the maximum output power of 40.4dBm for continuous wave measurements. For modulated signals, the power amplifier showed excellent linearity and high efficiency. For a 3.84MHz 6:6 dB peak to average power ratio W-CDMA signal at 1.75 GHz, the power amplifier achieved an adjacent channel leakage ratio of -48 dBc, an average power added efficiency of 44.9% and an average power of 33.1 dBm. The correlation between theory, simulated results and measured results is discussed to show the potential of the broadband, dynamic load modulated class-J power amplifier concept.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/199516
dc.language.isoeng
dc.setspec.uppsokPhysicsChemistryMaths
dc.subjectElektroteknik och elektronik
dc.subjectHållbar utveckling
dc.subjectInformations- och kommunikationsteknik
dc.subjectTelekommunikation
dc.subjectElektronik
dc.subjectElectrical Engineering, Electronic Engineering, Information Engineering
dc.subjectSustainable Development
dc.subjectInformation & Communication Technology
dc.subjectTelecommunications
dc.subjectElectronics
dc.titleA Class-J Power Amplifier with Varactor Based Dynamic Load Modulation
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeWireless, photonics and space engineering (MPWPS), MSc
Ladda ner
Original bundle
Visar 1 - 1 av 1
Bild (thumbnail)
Namn:
199516.pdf
Storlek:
9.21 MB
Format:
Adobe Portable Document Format
Beskrivning:
Fulltext
Ladda ner
Samling
Examensarbeten för masterexamen