University of Toronto Electronics Group Abstracts (Prof. Johns)

Table of Professor Johns's Students

Detailed Abstracts for Professor Johns's Students

• Amir Hadji-Abdolhamid
  M.A.Sc. Student (Jan. 1997 to Fall 1998), David Johns Supervising
  Direct e-mail to amir@eecg.toronto.edu

• Jasmine Cheng
  M.A.Sc. Student (Sep. 1996 to Apr. 1998), David Johns Supervising
  Direct e-mail to chengj@eecg.toronto.edu

• Kapil Kamra
  M.A.Sc. (Completed Summer 1996), David Johns Supervising
  Direct e-mail to kapil@eecg.toronto.edu
  See home page at ~kapil
  

  Abstract - Most adaptive filters used in industry today are digital. The rate of data transmission on a twisted pair copper wire is limited by the inability to equalize the channel at very high frequencies. The objective of this thesis is to investigate the use of analog adaptive filtering in equalizing a high speed twisted pair data communications channel. Speeds of 50 MHz and higher are being targeted. Analog adaptive filtering should be more beneficial than digital adaptive filtering since analog technology often uses less silicon area, consumes less power and attains higher speeds.

• Karen Kozma
  Ph.D. (Completed Fall 1996), David Johns & Adel Sedra Supervising
  Direct e-mail to karen@eecg.toronto.edu
  See home page at ~karen
  

  Abstract - This research addresses various aspects of tuning high-frequency continuous-time filters. It is well known, that the transfer function of continuous-time filters must be tuned over time as the transfer function varies due to fabrication tolerances and environmental changes. The tuning of continuous-time filters in the presence of parasitic poles is being investigated. As well, new approaches for tuning bandpass filters with high quality factors are being explored. Circuits and systems realizing the adaptive tuning of continuous-time filters are also being developed.

• Kasra Ardalan
  M.A.Sc. Student (Sep. 1996 to Fall 1997), David Johns Supervising
  Direct e-mail to kasra@eecg.toronto.edu
  See home page at ~kasra
  

• Khoman Phang
  Ph.D. Student (Fall 1995 to Summer 1999), David Johns Supervising
  Direct e-mail to kphang@eecg.toronto.edu
  See home page at ~kphang
  

  Abstract - I am currently in the midst of defining a research topic. Areas of interest include analog signal processing and adaptive equalization as applied to high-speed wired and wireless communications applications. One possible project would be to investigate the use of analog Viterbi decoders for turbo codes. This research could be applied to the areas of magnetic storage and communications over twisted-pair cable or infrared wireless optical links. The potential benefits would be reduced power consumption and the ability to process higher speed signals over conventional digital processing systems.

• Bob Richens
  Lab Technician, Kenneth Martin & David Johns & Adel Sedra Supervising
  Direct e-mail to richens@eecg.toronto.edu
  See home page at ~richens
  

  Abstract - Lab technician for the analogue electronics group, including lab and equipment maintenance, board design and inventory management.

• Mohammad Hossein Shakiba
  Ph.D. Student (Sep. 1991 to Summer 1997), David Johns & Kenneth Martin Supervising
  Direct e-mail to shakiba@eecg.toronto.edu
  See home page at ~shakiba
  

  Abstract - Analog Viterbi decoders offer the advantages of reduced power and size over digital implementations, primarily due to the elimination of the A/D converter. A new derivation of the Viterbi algorithm for decoding a class-IV partial-response signal is proposed. This algorithm leads to a very simple and fast structure with a complexity much less than that of the A/D converter by itself. A 200 MHz 3.3V class-IV decoder was designed and fabricated in the 0.8um BATMOS process, and experimental results confirm that a speed of 200 MSymbols/s can be achieved with only 30mW power consumption.

• Rod Zavari
  M.A.Sc. Student (Sep. 1996 to Apr. 1998), David Johns Supervising
  Direct e-mail to zavari@eecg.toronto.edu
  See home page at ~zavari
  

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