Thesis (M.S.)--Rochester Institute of Technology, 1993. / Typescript. Includes bibliographical references.

This thesis discusses the design of a stable 150 KW 23MHz RF system for the TRIUMF CRM cyclotron. The required characteristics of this system are presented with emphasis on the amplitude and phase modulation constraints. The composition of an amplifier system satisfying the power, bandwidth and noise requirements is discussed. Both the initial and present PA designs are presented, as is the design of the driver amplifier. Also included is a discussion of the choice of tubes and RF circuits. The usefulness of feedback control in satisfying the RF stability requirements is shown. The conditions a stable feedback system must satisfy are also given. Two amplitude control systems (drive control and screen control) are designed using Bode techniques. A digital simulation of these systems using an electrical analogue is presented. Implementation and results are discussed. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

by Cheung Chin Tao. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1989. / Bibliography: leaf [67].

No description available.

No description available.

This thesis investigates hair cell (He) homeostasis and the compression wave cochlear amplifier. In the first part of the thesis, an accurate physiological treatment of a generic HC is conducted using a nonlinear distributed parameter physical model. This model includes the major ionic species (sodium, potassium and chlorine), defining the active cellular homeostatic properties. This model is used for transient response analysis. Resting state and transient responses of the HC model are in excellent agreement with the experimental literature. HCs in this model are most simply classified as instantaneous nonlinear transduction devices (i. e. their homeostatic mechanisms are not significantly frequency selective). A compression wave cochlear amplifier (CW-CA) is defined and modelled for the first time in the second part of the thesis. It is a physiological model that addresses three main elements present in the peripheral hearing circuit: cochlear mechanics, HC nonlinearity, and neurology. The actual physiological feedback mechanism of the CW-CA is realistic. A passive travelling wave (or other mechanical) vibration is the input to the system. Whilst the travelling wave wiggles the Organ of Corti, the compression wave pulsates it. The CW-CA is an alternative to the physiologically ill-defined locally active travelling wave cochlear feedback amplifier proposed by others. The new CW-CA model results in a cycle-by-cycle amplifier with nonlinear response. It is capable of assuming an infinite number of different operating states. The stable and first few amplitude-limited unstable states are significant in describing the operation of the peripheral hearing system. The CW-CA model can explain a large number of hearing phenomena. Several of these are investigated by means of a system analysis for both the stable and unstable cases. The system is studied and the tone, two-tone suppression and distortion product responses are found to align well with published results. Explanations for various mechanical, HC and neurological phenomena are discussed and presented. For example, previously poorly understood phenomena such as otoacoustic emissions and neural spontaneous rates are accounted for.

Thesis (M.S. in electrical engineering)--Washington State University. / Includes bibliographical references.

In a transistorized push-pull amplifier, third order intermodulation distortion was effectively reduced at VHF frequencies with an output power of two watt. The non-linear distortion of the amplifier is modeled using a power series. The resulting expression is used as the basis for choosing the push-pull configuration to reduce the third order intermodulation distortion. The amplifier was built and tested, and the experimental results compare favorably with the theoretical results. The level of the third order intermodulation distortion is found to be at least 30 dB below the interfering signal level.

The paper discusses the theoretical analysis and the experimental work done to describe the cause of intermodulation distortion in class C transistorized amplifiers. A mathematical basis for the intermodulation was derived using a single frequency input and a second frequency introduced into the output of the amplifier. It was followed by experimental work performed to justify the theory. These experiments used both pulsed and sinusoidal drives as amplifier inputs. Also, a feedback method along with the transistor's operating point was shown to reduce the intermodulation distortion produced by the amplifier. Finally, a short discussion on the results and some of the applications of this research to V.H.F. amplifiers was presented.

This work contains the analysis and redesign of a translinear circuit. This circuit appeared in the article by Robert Blauschild. The Blauschild circuit was analyzed on H-SPICE, a VAX computer circuit analysis program, with Burr-Brown Integrated Circuit Process 30 models. Circuit improvement to input voltage to current converter stage and circuit simplification of the output stage were implemented and simulated in the redesign. The results of the two simulations were compared, which showed that the improvements were valid and useful. Going through this redesign cycle of circuit analysis, computer simulation and bread-boarding served as an actual design engineering application with a real problem, solution, and result scenarios.