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Title: Analogue-to-digital conversion using direct interpolation
Author: Deravi, F.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1988
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Analogue-to-digital converters provide the vital links between the physical world and the domain of digital information processing systems. Growing numbers of applications in recent years have been requiring increased resolution and accuracy from these devices. This thesis considers multiple-conversion techniques for the conversion process, where the speed of conversion and digital processing complexity are traded-off against converter performance. The review of multiple-conversion systems presented examines techniques employing oversampling, feedback and dither. The main subject of this work is the study of a Direct Interpolation System using analytical, numerical and experimental techniques. The ideal system is studied using statistical techniques and an expression is derived for quantization noise as a function of conversion rate. The performance of the system in the presence of linearity errors is studied with the use of a computer model. Simulation studies are used to find optimum parameter settings for the maximisation of the signal-to-noise ratio. Static and dynamic tests of converter performance are used in the modelling and evaluation of the Direct Interpolation system. The effect of linearity errors on the achievable performance of the system is investigated. The use of large-amplitude interpolation is found to significantly improve converter performance. The predicted results are confirmed using measurements conducted on an experimental system.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available