Electrical and Computer Engineering Commons^™

Design And Operation Of A Microprogrammed Branch Driver For A Pdp-11 Computer., Lavon R. Biswell

Electrical and Computer Engineering ETDs

A Microprogramned Branch Driver (MBD) is the interface between Digital Equipment Corporation (DEC) PDP-11 series computers and a multicrate CAMAC system. The MBD is a microprocessor-controlled multiple, direct memory access (DMA) channel branch driver.

The requirements for an MBD are discussed in the introduction and stem from a Los Alamos Scientific Laboratory (LASL) study group report on the design of the Clinton P. Anderson Meson Physics Facility (LAMPF) data acquisition system. Because of the desire for the standard system, the types of experiments and data rates, and the varying complexity of the data acquisition systems, it was decided that a …

A New Optimization Procedure For Digital Simulation, Donald Howard Schroeder

Electrical and Computer Engineering ETDs

The theory needed to define and obtain an optimized digital simulation of a given continuous system is presented in this dissertation. The frequency domain approach to simulation is used and a nonlinear function minimization algorithm, implemented on a digital computer, is incorporated to obtain the optimum simulation.

The discrete transfer function obtained from z-transform theory is used to represent the digital system. The frequency domain response of this discrete transfer function can then be expressed simply as a function of frequency, for frequencies up to one-half the sampling frequency. A frequency domain error measure, in the complex plane, is defined …

Gallium-Arsenide-Phosphide Mis Capacitor Fabrication And Radiation-Effects Studies, Douglas H. Phillips

Electrical and Computer Engineering ETDs

GaAsP MIS capacitors were fabricated using several dielectric-growth processes, including RF sputtering, wet oxidation, and dry oxidation of GaAsP. Dry oxidation of GaAsP surfaces produced MIS devices having the best charac­teristics. Instabilities of early MIS capacitors were over­come by use of thermal cycling techniques and chromium-doped dielectrics. Deep-depletion characteristics were observed for GaAsP MIS C-V curves, even in the range of applied bias which theoretically should result in inversion of the GaAsP surface. Both low-frequency and high-frequency C-V data support the conclusion that inversion characteristics were not observed for GaAsP MIS capacitors. Calculated high-frequency surface-state density and surface-state charge values …

Low Temperature Investigations On Epitaxial Silicon Using The Micro-Hall Device, Joseph P. Baca

Electrical and Computer Engineering ETDs

This report is concerned with the feasibility of using the micro-Hall device, introduced by Colclaser and Southward, as a tool for determining important electrical characteristics of epitaxial silicon at low temperatures. The theory of carrier concentration and mobility as a function of temperature in the low temperature range is presented. A contact diffusion mask is introduced which eliminates the formation of an unwanted junction at the substrate contacts and aids in the formation of ohmic contacts. The refrigerator (cryo-tip) used to obtain low temperatures and a special designed specimen holder which connects to the cryo-tip are described.