Record Details     « New Search       Brief Record Full Record MARC Record     Bibliographic Data Control Number UPD-00000125265 Date and Time of Latest Transaction 20090716212340.0 General Information 080209s1996 xx eng Cataloging Source DML Language Code eng Local Call Number LG 995 1996 E6 O37 Main Entry - Personal Name Ochave, Victorio E. A. Title Statement Nonlinear modeling and circuit optimization of GaAs MESFET oscillators / Victorio E.A. Ochave, Jr Physical Description 333 leaves : ill General Note Computer print-out Summary, Etc. A nonlinear optimization procedure to design power-optimum GaAs MESFET microwave oscillators is investigated and implemented in this thesis. The method aims to eliminate the empirical nature of microwave oscillator design. To carry out the procedure, a large-signal GaAs MESFET model is constructed; the model simulates device breakdown and accounts for the frequency dispersive behavior of output conductance. A direct extraction of small-signal model elements is undertaken, while the large-signal model parameters are obtained using a simultaneous fitting of measured device DC and RF data to nonlinear expressions representing optimizer in conjunction with a quasi-Newton scheme is employed in the extraction of the large-signal model parameters. The harmonic balance method is used to compute the steady-state terminal currents, while a coupled random-gradient optimizer is used to search for the optimum device port voltages that will induce the device to operate at prespecified conditions. The nonlinear design method is shown to result in GaAs MESFET oscillator designs that operate nearer the desired frequency of operation and with higher RF output power, compared to circuits designed using conventional methods Subject Added Entry - Topical Term Oscillators, Microwave   Metal semiconductor field-effect transistors   Oscillators, Electric Collection Category Fi Location UP DENG-II LG 995 1996 E6 O37 E2000000286 Room-Use Only E2-46T Collection Category UP Location UP DARCHIVES LG 995 1996 E6 O37 Room-Use Only ARCHIVES-8604T   UP DENG-II LG 995 1996 E6 O37 E2000000286 Room-Use Only E2-46T   UP DARCHIVES LG 995 1996 E6 O37 Room-Use Only ARCHIVES-8604T   UP DENG-II LG 995 1996 E6 O37 E2000000286 Room-Use Only E2-46T Textual Physical Form Designator Thesis           Physical Location University of the Philippines Diliman Main Library: University Archives LG 995 / 1996 E6 O37 Diliman: College of Engineering Library II LG 995 / 1996 E6 O37           Digital Copy Not Available          Add to Book Cart  |   Download MARC