Thesis (M.S.)--University of Wisconsin--Madison, 1964. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 83.

Thesis (M.S.)--University of Wisconsin--Madison, 1964. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 178-192.

No description available.

Direct current controlled transductors, now known as magnetic amplifiers, were used successfully by the Germans in the 1939-1945 war for the amplification and mixing of powers down to a microwatt. The desire to know more about their operations than has been given in various periodicals prompted this thesis. An explanation of magnetic amplifier action is given and the waveforms of flux and output current predicted. The behaviour of circuits containing a magnetic amplifier is then explained by the use of waveforms and a mathematical investigation is made. A use for a magnetic amplifier in an oscillator tank circuit is described. Graphs of the characteristics of the magnetic amplifier and photographs of the waveforms are shown and the observed waveforms compared with the predicted ones. A sensitivity test on three circuits containing a magnetic amplifier is described and results given showing that by placing a condenser across the supply windings increases the sensitivity considerably but decreases the power amplification. The proper way to secure a thorough understanding of the properties of the magnetic amplifier by the use of an oscilloscope is discussed and the thesis concludes by listing the advantages and disadvantages of a magnetic amplifier. The mathematical approach to the solution of the magnetic amplifier problem using Frolich's equation for the magnetization curve is given in a special appendix. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Thesis (M.S.)--Oregon State University, 2005. / Printout. Includes bibliographical references (leaves 76-79). Also available on the World Wide Web.

Thesis (MScIng)--University of Stellenbosch, 2006. / Bibliography. Also available via the Internet.

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.

The objective of this research is to develop, characterize, and demonstrate novel parametric architectures capable of wideband operation while maintaining high gain and stability. To begin the study, phase-incoherent upconverting parametric amplifiers will be explored by first developing a set of analytical models describing their achievable gain and efficiency. These models will provide a set of design tools to optimize and evaluate prototype circuit boards. The prototype boards will then be used to demonstrate their achievable gain, bandwidth, efficiency, and stability. Further investigation of the analytical models and data collected from the prototype boards will conclude bandwidth and gain limitations and end the investigation into phase-incoherent upconverting parametric amplifiers in lieu of negative-resistance parametric amplifiers. Traditionally, there were two versions of negative-resistance parametric amplifiers available: degenerate and non-degenerate. Both modes of operation are considered single-frequency amplifiers because both the input and output frequencies occur at the source frequency. Degenerate parametric amplifiers offer more power gain than their non-degenerate counterpart and do not require additional circuitry for idler currents. As a result, a phase-coherent degenerate parametric amplifier printed circuit board prototype will be built to investigate achievable gain, bandwidth, and stability. Analytical models will be developed to describe the gain and efficiency of phase-coherent degenerate parametric amplifiers. The presence of a negative resistance suggests the possibility of instability under certain operating conditions, therefore, an in-depth stability study of phase-coherent degenerate parametric amplifiers will be performed. The observation of upconversion gain in phase-coherent degenerate parametric amplifiers will spark investigation into a previously unknown parametric architecture: phase-coherent upconverting parametric amplifiers. Using the phase-coherent degenerate parametric amplifier prototype board, stable phase-coherent upconversion with gain will be demonstrated from the source input frequency to its third harmonic. An analytical model describing the large-signal transducer gain of phase-coherent upconverting parametric amplifiers from the first to the third harmonic of the source input will be derived and validated using the prototype board and simulations.

No description available.

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.