Date of Publication

2009

Document Type

Master's Thesis

Degree Name

Master of Science in Electronics and Communications Engineering

Subject Categories

Other Engineering

College

Gokongwei College of Engineering

Department/Unit

Electronics and Communications Engineering

Thesis Adviser

Felicito S. Caluyo

Defense Panel Chair

Edwin Sybingco

Defense Panel Member

Gerino P. Mapatao
Enrique M. Manzano

Abstract/Summary

Recent studies show that power amplifiers based on gallium nitride (GaN) high electron mobility transistors (HEMT) technology achieve higher power density compared to Silicon and GaAs field effect transistors (FET) due its wideband gap property and heterostructure. This results to higher power per transistor die size (W/mm), lower inherent parasitic components and thus broadband performance. This document describes the design and implementation of a 200W single ended Class AB broadband amplifier module operating from 2GHz to 2.2 GHz. With an IS95 test signal, the measured backoff gain and drain efficiency across the band is at 13.8dB and 28% respectively. Gain flatness is +/- 0.5 dB. The high source and load impedances at the package leads were achieved at the package leads with the optimized package design. Three broadband package topologies were studied and compared. Simulations suggest that package output bandwidth can be significantly improved with the InShin topology. 6 A design flow is described which yielded a first time right design. A large signal equivalent package model was extracted by using small signal and large signal measurements. The impedance transformation of the package components and PCB design was optimized not to exceed the inherent Q of the FET to maximize bandwidth. Optimum impedances from load pull measurements were used to realize the application circuit.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTG004542

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

187 leaves ; 28 cm.

Keywords

Transistor amplifiers; Power amplifiers; Gallium nitride; High-electron-mobility transistors; Modulation-doped field-effect transistors

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