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Current Research Projects

  1. Mixed analog-digital design and application to RFID and Biomedical systems

    The research investigates new design techniques for low power and low voltage mixed mode analogue-digital circuits using CMOS VLSI technology for a commercial radio frequency object identification system. The integration of all circuitry on a single substrate has a lot of benefits such as improving the system reliability, reducing the system size, increasing inter-system communication speed and making system implementation more cost effective. On the other hand, some difficulties arise as most CMOS technologies are tuned towards digital circuit design and have a wide spread in transistor parameters. The research is concentrating on techniques for designing low power, low voltage analogue and digital circuits for implementation in standard CMOS technologies.

    Support: The University of Adelaide


  2. Ultra high speed analog to digital converters using SEED technology (with Dr. Corbett and Tony Sarros)

    This project involves novel designs for very high-speed data converters using Self Electro-optic Effect Device (SEED). The project has two main streams, the first is the design of novel architectures for Nyquist rate analog-to-digital converters that operate at 10-50 GSample per second with four to five bits of resolution, while the second stream is concerned with novel data converters that operate at a similar number of samples per second with much higher resolution in the order of 16-20 bits. The latter is achieved by trading the resolution in time for the required bit resolution, hence over sampling data converter principles are utilised. The project involves designs at a number of system design levels that include architectural, circuits and device level. The application of the over sampling converters are in wideband communications surveillance systems and digital radio receivers, which require high speed, high resolution and high linearity data converters. The high speed Nyquist rate data converter are used in generic wideband electronic systems that require very high speed converters but with less demanding specifications for resolution and linearity.

    Support: The University of Adelaide

  3. Very high speed analog to digital converters using CMOS technology (with Mr. Mike Liebelt and Yingbo Zhu)

  4. Digital circuit design using neuron-MOS technology (with Associate Prof. Abbott)

  5. High speed digital arithmetic (with Peter Celinski)

    In recent years, there has been renewed interest in threshold logic, mainly as a result of the development of a number of successful implementations of CMOS threshold logic gates. Threshold logic enables the design of digital integrated circuits with a significant reduction in transistor count, area and power dissipation, and improved speed performance. In this project, we investigate the design of arithmetic circuits including parallel counters, adders and multipliers based in two high performance threshold logic gate implementations which we have developed. 

    Support: The University of Adelaide

  6. Low-power, low-phase noise voltage-controlled oscillator using silicon on insulators (with Associate Prof. Lim and Wan-Chul Kong)

    This research aims to develop a monolithic voltage controlled oscillator characterised by low phase noise in silicon-on-sapphire CMOS process. Preceding the research are structured studies that endeavour to analyse device physics of silicon-on-sapphire CMOS, investigate phase noise characteristic of the voltage controlled oscillator and devise a filtering technique for lower phase noise.

    Support: The University of Adelaide, St. Jude Medical (USA)

  7. High efficiency power amplifier (with Associate Prof. Coleman and Nazif Farid)

    The field of wireless communications has been experiencing tremendous growth recently as the numerous advantages have made many applications wireless. Due to the limited power available, wireless products have to consume very little power. This requirement presents designers with a very challenging task considering the gigahertz frequencies at which those products are meant to function. This research looks into the feasibility of designing a very low power transmitter in CMOS and SOI technologies for remote monitoring applications such as temperature sensing. The transmitter will operate in the 2.4 GHz ISM band. Furthermore, to improve the system immunity to noise and interference a spread spectrum transmission is used. The output power level of interest ranges between 10 mW to 100 mW rms for reliable transmission. Consequently, very efficient power amplifiers and back-end circuitry such as ADCs are needed due to the power constraints.

    Support: The University of Adelaide

  8. Artificial insect vision (with Associate Prof. Abbott and Leo Lee)

    The objective is to map insect vision algorithms onto VLSI to make smart collision avoidance chips. Our goal is to apply the latest neurophysiological models using contrast adaptation.  

    Support: Australian Research Council, Sir Ross & Sir Keith Smith Foundation, AFSOR (USA)  

  9. Highly programmable digital receiver design (with Dr. Marwood)

School of Electrical and Electronic Engineering
SA 5005

Office: EM411
Engineering & Maths Building

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Phone: (+61 8) 8303 4198

Facsimile: (+61 8) 8303 4360

Email: alsarawi@eleceng.adelaide.edu.au

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