Travelling-wave frequency conversion.
| dc.contributor.advisor | Nattrass, Henry Lee. | |
| dc.contributor.author | Ham, Ronald Edgar. | |
| dc.date.accessioned | 2012-10-14T13:54:22Z | |
| dc.date.available | 2012-10-14T13:54:22Z | |
| dc.date.created | 1985 | |
| dc.date.issued | 1985 | |
| dc.description | Thesis (Ph.D.)-University of Natal, Durban, 1985. | en |
| dc.description.abstract | Travelling-wave distributed amplifiers are providing gain over broad frequency ranges for microwave applications. Similar concepts are applicable to distributed mixers and, with the use of controlled feedback, to a multifunction component simultaneously emulating a mixer, amplifier and an oscillator. The concept of this new travelling-wave frequency converter is introduced and data for a discrete component test circuit is presented. To facilitate the converter operation a new three-port travelling-wave mixer is introduced and characterized. Four-port scattering and wave scattering transformations are derived as a method of analysis of the four-port distributed structure. This enables sequential circuit analysis on a small computer. Practical applications unique to the advanced automatic network analyser, including time domain measurements, are presented to characterize test circuits as well as to develop ancillary equipment such as a transistor test fixture. Automated error corrected transistor measurements and de-embedding are also discussed. A piecewise linear quantum mechanical method of modelling the conduction channel of a short gate field effect transistor is given to aid the extrapolation of the distributed frequency converter concept to submicron and heterojunction structures. | en |
| dc.identifier.uri | http://hdl.handle.net/10413/6892 | |
| dc.language.iso | en | en |
| dc.subject | Travelling wave tubes. | en |
| dc.subject | Distributed amplifiers. | en |
| dc.subject | Microwave circuits. | en |
| dc.subject | Theses--Electronic engineering. | en |
| dc.title | Travelling-wave frequency conversion. | en |
| dc.type | Thesis | en |