University of Toronto Electronics Group Abstracts (Prof. Sedra)

Table of Professor Sedra's Students

Detailed Abstracts for Professor Sedra's Students

• 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.

• Chris Ouslis
  Research Associate, Adel Sedra Supervising
  Direct e-mail to ouslis@eecg.toronto.edu
  See home page at ~filtorx
  

  Abstract - Design, programming, support, and maintenance of the filter-design software filtorX. See associated web pages for more details and ordering information.

• Ralph A I Duncan
  Ph.D. (Completed June 1995), Kenneth Martin & Adel Sedra Supervising
  Direct e-mail to ralph@eecg.toronto.edu

  Abstract - A tunable 1 GHz active-LCR oscillator with on-chip inductors was designed and fabricated for use in front-end demodulation schemes. Additionally, an active-LCR filter based on positive-feedback for on-chip inductor Q-enhancment was designed and fabricated. Both circuits were fabricated in the BATMOS process and later tested.

• 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.

• Steve Jantzi
  Ph.D. Student (Sep. 1992 to Summer 1997), Kenneth Martin & Adel Sedra Supervising
  Direct e-mail to steve@eecg.toronto.edu
  See home page at ~steve
  

  Abstract - A 4th-order complex bandpass sigma-delta analog-to-digital converter has been designed and submitted for fabrication in the 0.8um BATMOS process as well as a 0.5um CMOS process. This A/D conversion scheme works directly on the pair of quadrature outputs from the front-end mixer, performing bandpass A/D conversion rather than low-pass conversion, thus reducing image problems and eliminating concerns about self-EMI and 1/f noise. The circuit is designed to clock at 13 MHz (for cellular receivers) and to convert incoming quadrature signals with 4.875 MHz centre frequency and up to 200 kHz (GSM) bandwidth. The converter should realize more than 70dB SNR. Smaller bandwidths can also be converted, such as 100 kHz (CT2+) and 30 kHz (IS-54, AMPS), with SNR increasing for narrower bandwidths.

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