Advanced Doherty Power Amplifier Architectures for Broadband and Multistandard Wireless Transceivers

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dc.contributor.advisorGhannouchi, Fadhel
dc.contributor.authorDarraji, Ramzi
dc.date.accessioned2013-01-25T17:19:00Z
dc.date.available2013-06-21T07:01:27Z
dc.date.embargolift2017-07-15T07:00:00Z
dc.date.issued2013-01-25
dc.date.submitted2013en
dc.description.abstractPower amplifiers (PAs) have always been a pivotal front-end building block in wireless communication transmitters. As signal modulation schemes become more spectrally efficient and cellular traffic increasingly intense, the radio frequency (RF) performance of PAs should be constantly improved. This can be achieved by improving the analog circuit design of the PA and by including additional software and system features to balance energy consumption and performance. This thesis focuses on several aspects related to power efficiency enhancement and bandwidth extension of wireless Doherty PAs using baseband digital signal processing (DSP) techniques. A variety of digital signal conditioning algorithms are proposed to enable optimal Doherty PA operation at and beyond its nominal frequency bandwidth. An innovative dual-input Doherty PA architecture is also presented in this work to enable the implementation of these advanced DSP techniques. Analog circuit design and optimization approaches are investigated and proposed for the enhancement of Doherty PA performance. Experimental implementation is carried out to validate the proposed techniques. Critical issues related to complex gain imbalance as well as energy waste within the RF building blocks of the Doherty PA are studied and mitigated. Two advanced methodologies, namely digital adaptive phase alignment and digital adaptive input power distribution, are developed to effectively address the above-mentioned problems. The frequency response of Doherty PAs is analyzed; and, a novel digital domain based precompensation mechanism is derived to mitigate the bandwidth limitations of Doherty PAs, resulting in substantial bandwidth extension. An original architecture of a digitally equalized Doherty PA based RF front-end is proposed to allow the use of Doherty PAs in the context of wide bandwidth and multistandard radios.en_US
dc.identifier.citationDarraji, R. (2013). Advanced Doherty Power Amplifier Architectures for Broadband and Multistandard Wireless Transceivers (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/24721en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/24721
dc.identifier.urihttp://hdl.handle.net/11023/473
dc.language.isoeng
dc.publisher.facultyGraduate Studies
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectEngineering--Electronics and Electrical
dc.subject.classificationBroadbanden_US
dc.subject.classificationMultistandarden_US
dc.subject.classificationDohertyen_US
dc.subject.classificationTransmittersen_US
dc.titleAdvanced Doherty Power Amplifier Architectures for Broadband and Multistandard Wireless Transceivers
dc.typedoctoral thesis
thesis.degree.disciplineElectrical and Computer Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
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