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Title:Charge control in acoustic charge transport devices
Author(s):Schmukler, Bruce C.
Doctoral Committee Chair(s):Hunsinger, Bill J.
Department / Program:Electrical and Computer Engineering
Discipline:Electrical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Electronics and Electrical
Abstract:Acoustic charge transport (ACT) devices utilize the acoustoelectric effect in a piezoelectric semiconductor, particularly GaAs, to create buried channel charge transfer devices capable of signal processing functions, especially transversal filtering. Charge control in ACT devices concerns the control and accounting of charge with the goal of preserving signal integrity. Two key aspects of charge control are the influence of perturbing channel potentials on the ACT properties, which are principally charge capacity and transfer efficiency, and the charge storage process, which is the inhibition of ACT via barrier potentials applied to surface electrodes. Several charge control topics are investigated in this work using experimental devices and numerical modeling.
The effects of static barrier potentials on ACT properties are investigated and an empirical model predicting charge capacity loss as a function of barrier field is developed. A device with several differently sized surface metallization gratings is used to investigate the effect of gratings on ACT properties. The dynamics of charge storage are investigated with regard to storage voltage, storage mode charge capacity (called storage capacity), and frequency response. The concept of double-packet charge storage is introduced and the properties of single-packet, double-packet and multipacket charge storage are investigated and compared. The key limiting factors regarding storage capacity are identified. Finally, numerical techniques to simulate ACT charge capacities and storage capacities are investigated, and a new method known as charge screening is introduced.
Issue Date:1989
Rights Information:Copyright 1989 Schmukler, Bruce C.
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9011103
OCLC Identifier:(UMI)AAI9011103

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