Given the mature state of circuit theory and analog circuit design, the focus of microelectronics research is shifting and becoming more application-driven. As integrated systems become increasingly complex, analog circuits play a crucial role in the successful realization of systems embedding not only both analog and digital signals, but also different forms of environmental sensing, intelligence, signal processing, and communication. My research focus is on developing analog integrated circuits for applications involving optoelectronics and photonics, and for biomedical devices.
Optoelectronic Integrated Circuits (OEICs)
OEICs encompass integrated circuits with embedded optoelectronics and multi-chip assemblies that combine optoelectronics, optical interface circuitry, and mixed-mode VLSI design. Our research addresses the challenges of developing OEICs for applications that combine photonics, optoelectronics and microelectronics. These applications are growing in multitude and span the consumer, industrial, and biomedical sectors. Examples include
Our research is focused on the development and integration of the key building blocks common to these applications:photodetectors, optical preamplifiers, and timing and data recovery circuits. To date, we have developed new spatially-modulated CMOS photodetectors with reduced intersymbol interference, optical preamplifier circuits with improved stability, ambient light rejection, and low voltage operation, and oscillator circuits that are low jitter and robust to system supply noise.
To date, our research has been applied to consumer and industrial applications such as IR wireless links, optical drives, and optical interconnect. In the future, our research will encompass biomedical and photonic applications such as optical biosensor arrays and the development of a ‘lab-on-a-chip’.
Biomedical Electronic Devices
The development of microelectronics for biomedical devices is one of today’s great research opportunities. The field is vast and includes implantable prosthetics, telemetry, biosensors and instrumentation. Typical design challenges include low power and low noise, battery-less operation, and biocompatibility.
To date, we have developed a micropower, programmable filter for hearing aids and an infrared wireless receiver powered only by the received optical signal. Our most recent work has focused on functional electrical stimulation (FES) involving both transcutaneous and implantable stimulation methods . In the future, our research will include EMG sensing, goniometry, analog-to-digital conversion, and RF telemetry. In particular, we hope to leverage our expertise in OEICs to develop biosensors for fluoroscopy and DNA sequencing.
Analog Integrated Circuit Design
Our research focuses on the development of analog building blocks in general, and on low-voltage, low-power analog circuits in particular. The development of low-voltage, low-power analog integrated circuits has been driven by the rapid development of portable systems requiring lower power dissipation, and by the continual reduction in operating voltages for modern CMOS technologies due to shrinking feature sizes.
Low-voltage circuits are often more complex than their traditional counterparts. A comparison between nested-Miller compensation and traditional lead-lag compensation of op amps is a good example. These novel circuit topologies often do not lend themselves to traditional feedback analysis techniques. As such, part of our work involves developing graphical circuit analysis techniques which can be used for the design and analysis of analog circuits.
Interested in graduate school?
I am personally not accepting any new graduate students.
However, the University of Toronto has one of the
strongest electronics research groups in the world, and I encourage you to contact
our other professors in the department. You can find a brief description of all the
professors and links to their web sites by going to
For more information about applying for graduate studies, please see our
Graduate Office web site.
I proudly present for you my current team of bright and motivated students:
Last updated July 06, 2005