Lau, Mark C.2014-03-142014-03-141997-07-23etd-7497-162858http://hdl.handle.net/10919/36952The development of microwave Gallium Arsenide Metal Semiconductor Field Effect Transistor (MESFET) devices has enabled the miniaturization of pagers, cellular phones, and other electronic devices. With these MESFET devices comes the need to model them. This thesis extracts a small signal equivalent circuit model from a Gallium Arsenide MESFET device. The approach taken in this thesis is to use measured S- parameters to extract a small signal equivalent circuit model by optimization. Small signal models and S-parameters are explained. The Simplex Method is used to optimize the small signal equivalent circuit model. A thorough analysis of the strengths and weaknesses of the Simplex method is performed.In CopyrightMESFETGallium ArsenideSmall SignalModelingSimplex MethodThesishttp://scholar.lib.vt.edu/theses/available/etd-7497-162858/