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Title: Modeling and Simulation of Submicron Aluminium Gallium Nitride AlGaN GaN based Microwave Power HEMTs for High Speed Circuit Applications
Researcher: Rajesh Kumar Tyagi
Guide(s): Sujata Pandey
University: Guru Gobind Singh Indraprastha University
Completed Date: 2010
Abstract: The increasing data rates demanded by third generation cellular communication systems and other high frequency applications require the use of power amplifiers operating at frequencies exceeding 100 GHz with output of the order of hundreds to thousands of watts. The area of very high frequency, very high power electronics is currently dominated by vacuum tube based devices as conventional semiconductor devices suffer from relatively low breakdown voltages precluding their operation at very high voltages and high powers. The vacuum tube based devices, however, suffer from the issues of high cost, large size and reliability issues. In recent years AlGaN/GaN HEMTs have demonstrated output power densities as high as 120 W/mm operating at microwave frequencies greater than 100 GHz. The extremely high output power density levels are achieved due to the high breakdown voltages of these wide band gap devices and due to the large polarization induced charge leading to high output current densities. This work investigates the performance of the AlGaN/GaN HEMTs using device modeling. Polarization effects have been incorporated using a highly doped AlGaN spacer layer. This thesis examines the effect of the device structure and doping profile on the AlGaN/GaN HEMTs microwave performance including the unilateral power gain and maximum frequency of oscillation. newlineThe thesis concludes by suggesting the scope of further research in this area.
Appears in Departments:University School of Engineering and Technology

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01 title cetificate ack abst toc abbre.pdfAttached File271.65 kBAdobe PDFView/Open
02 chapter1.pdf695.66 kBAdobe PDFView/Open
03 chapter2.pdf414.94 kBAdobe PDFView/Open
04 chapter3.pdf233.03 kBAdobe PDFView/Open
05 chapter4.pdf219.3 kBAdobe PDFView/Open
06 chapter5.pdf47.54 kBAdobe PDFView/Open
07 references.pdf108.7 kBAdobe PDFView/Open
08 appendix.pdf89.16 kBAdobe PDFView/Open
09 list of publications.pdf29.11 kBAdobe PDFView/Open
10 biodata.pdf22.25 kBAdobe PDFView/Open

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