Paul Beckett

RMIT University, School of Electrical and Computer Engineering, Faculty Member

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Papers by Paul Beckett

An FPGA-Based Digital Class-D Amplifier Using Short Word-Length

by Paul Beckett, Zahir M Hussain, and Geoff Lethbridge

Abstract— A digital Class-D amplifier based on single-bit processing to be implemented on a Field... more Abstract— A digital Class-D amplifier based on single-bit
processing to be implemented on a Field Programmable Gate
Array (FPGA) is presented. The main focus of this design is the
reduction of noise, a drawback of Class-D amplifiers, by
exploring the noise-shaping characteristics of Sigma-Delta
Modulation (SDM). The audio signal is retained in the digital
single-bit domain until the final stage of the amplifier, thus
avoiding quantization noise due to conversion. This paper focuses on the SDM and digital signal processing (DSP) components of the design to be implemented on the FPGA.

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Exploiting multiple functionality for nano-scale reconfigurable systems

It is likely that it will become increasingly difficult to manufacture the complex, heterogeneous... more It is likely that it will become increasingly difficult to manufacture the complex, heterogeneous logic structures that characterise current reconfigurable logic systems. As a result, these systems may come to be characterised by vast arrays of largely identical devices that are differentiated via postfabrication configuration -but only if low-overhead configuration can be achieved. Two simulation studies are presented that describe some ideas for achieving low-overhead reconfigurability in systems built from nano-scale components. The first is based on variable-threshold devices built from thin-body double gate transistors while a second, more speculative idea is based on recently identified resonant tunneling behaviour in carbon nanotubes. Various logic functions can be configured via the application of a simple bias voltage. Further, two approaches to the issue of generating the required bias voltages based on RTD devices and chalcogenide films are briefly explored.

format_quoteEmerging technologies in molecular electronics and quantum dots indicate new pathways for developing low-overhead reconfigurable systems.format_quote

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Towards nanocomputer architecture

At the nanometer scale, the focus of micro-architecture will move from processing to communicatio... more At the nanometer scale, the focus of micro-architecture will move from processing to communication. Most general computer architectures to date have been based on a "stored program" paradigm that differentiates between memory and processing and relies on communication over busses and other (relatively) long distance mechanisms.

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Runway Width Effects in the Visual Approach to Landing

International Journal of Aviation Psychology, 2001

The effect of changes in runway width on the perception of glide-slope has been the subject of ex... more The effect of changes in runway width on the perception of glide-slope has been the subject of extensive investigations. Despite considerable research, an explanation of this effect has been elusive. A mathematical model for glide-slope perception was published recently based on the premise that a desirable goal of perception is to form a perception with minimal uncertainty. One of the qualitative predictions of that model was that changes in the aspect ratio of the runway would affect the perceived glide-slope. In this article, the predictions of the model are quantified and are shown to be in close agreement with experimental results in the literature.

A Mathematical Model of Glide-Slope Perception in the Visual Approach to Landing

International Journal of Aviation Psychology, 1998

ABSTRACT A mathematical model of glide-slope perception is presented for the visual approach to l... more ABSTRACT A mathematical model of glide-slope perception is presented for the visual approach to landing when there is a visually impoverished scene. The perceptual process has been modeled as the weighted average of the geometric relations in the scene that provide glide-slope information, with weights being adjusted during the approach to minimize the uncertainty in glide-slope perception. The model suggests that the optimum combination of relations providing glide-slope information is dependent on the range from the runway threshold and that there is a relation between the handling qualities of aircraft or flight simulators and the adjustment of the weights.

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