This thesis is an account of studies of the high speed switching properties of logic circuits employing transistors. Properties of both the transistor and its associated circuitry are described largely in terms of charge parameters, to simplify the analysis of the transient responses. A system of analysis which uses piecewise-linear switching waveforms is presented, which is capable of reducing an essentially non-linear problem to linear terms whilst preserving sufficient accuracy to yield useful results. By this means predictions of the transient response of circuits operating under typical conditions of interconnection can be made with a minimum of mathematical complexity. The effect of each circuit parameter on the overall performance of the circuits is preserved in physical terms which are useful to the circuit engineer. A particular family of defined current circuits is used to illustrate the theory, and optimum circuits obtained from application of the analysis. Results show that the desirable working conditions for fastest response are not always attainable in practice due to the limitations of the working ranges of practical devices. A study is made of the recovery of reactive elements in the coupling circuits, and leads to a fundamental conclusion regarding the resolving time of reactively coupled circuits when they are not allowed to become underdamped. As a result, optimisation of such circuits can be described completely in terms of the response to the first two edges of a suddenly applied switching signal. Improvements to the basic circuits suggested by the results of the analysis are discussed, and the thesis ends with an indication of other investigations which might be carried out.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:602136 |
| Date | January 1962 |
| Creators | Vickery, Joseph Colin |
| Publisher | Imperial College London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/10044/1/13592 |
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