Browsing by Subject "analytical model"
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Item Analytical models of single and double gate JFETs for low power applications(2009-05) Chang, Jiwon, active 2013; Banerjee, Sanjay; Register, Leonard F.I propose compact models of single-gate (SG) and double-gate (DG) JFETs predicting the current-voltage characteristics for both long and short channel devices. In order to make the current equation continuous through all operating conditions from subthreshold to well-above threshold, without non-physical fitting parameters, mobile carriers in depletion region are considered. For describing the short channel behavior, relevant parameters extracted from the two-dimensional analytical solution of Poisson's equation are used for modifying long channel equations. Comparisons of models with the numerical simulation showing close agreement are presented. Based on models, merits of DG JFET over SG JFET and SG MOSFET are discussed by examining the schematic circuit diagram describing the relation between gate and channel potentials for each device.Item Strength Enhancement of cellular structures through selective reinforcement of elements based on analytical modeling(University of Texas at Austin, 2023) Koju, Naresh; Yang, LiThis work investigates the strength enhancement of 2D cellular structures via individual element thickness optimization based on the analytical model for critical elements. To focus on the investigation of the enhancement method, a rather simplified perfectly elastic material property was assumed, and an analytical model was utilized to identify the critical element of several cellular structure designs. Stepwise element thickness enhancement was utilized to investigate the effectiveness of overall strength enhancement. The results indicate that the strength of cellular structures can be improved by selectively reinforcing critical elements. In addition, the enhanced cellular structures also exhibit altered fracture failure characteristics that could potentially be exploited for more application objectives.