A joint project of the Graduate School, Peabody College, and the Jean & Alexander Heard Library

Title page for ETD etd-09212017-152911


Type of Document Master's Thesis
Author McCurdy, Michael William Adelino
URN etd-09212017-152911
Title 1.8 MeV proton response of thermally stabilized gallium nitride RF power transistors
Degree Master of Science
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Ronald. D. Schrimpf Committee Chair
Daniel M. Fleetwood Committee Member
Keywords
  • RF
  • HEMT
  • GaN
  • protons
Date of Defense 2017-09-20
Availability unrestricted
Abstract
Three commercially available GaN-based HEMT RF power devices were irradiated with 1.8 MeV protons in three operational modes. The operational modes were semi-on, fully-on and RF-on. The former two modes were low and manufacturer-specified quiescent levels of DC bias. The latter mode was at the manufacturer-specified quiescent DC bias with the test article under power RF operation. Thermoelectric cooling was used to minimize thermally induced parametric shifts. Electrical measurements such as ID-VG sweeps were conducted from which threshold voltage, VTH, and transconductance, gm, were calculated and plotted. RF parameters of interest were measured. S-parameter sweeps were conducted in the low power linear operational regime as well as gain measurements at a higher power level. Responses were plotted in terms of gain vs. frequency, gain vs. fluence and on Smith charts. One part type exhibited increased RF small signal gain with increasing fluence over all operational modes. The variety of responses seen indicate thorough testing of candidate devices should be performed to ensure the required level of operation for applications with high reliability requirements.
Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  McCurdy.pdf 6.25 Mb 00:28:56 00:14:53 00:13:01 00:06:30 00:00:33

Browse All Available ETDs by ( Author | Department )

If you have more questions or technical problems, please Contact LITS.