IEEE Solid-State Circuits Magazine - Winter 2016 - 31
Miles was very popular as a lecturer with
an enthusiastic and engaging style that made
the material he covered exciting.
converters (ADCs), digital-to-analog
converters (DACs), and filters, which
were needed for every telephone
line in a digital switch. BNR was a
center of analog MOS R&D and introduced the world's first codec in
1978. Miles, along with several students, conducted circuit research
that helped this effort, including
the invention of the switchedcapacitor filter. Terry Caves's article in this issue, "Miles Copeland's
Switched Capacitor," describes this
in detail. The codec became the first
"killer app" for analog MOS. Soon
most other major telecom companies, including AT&T Bell Labs,
Siemens and Alcatel, started developing digital telecom switches and
several semiconductor suppliers
began developing codec ICs. Three
of Miles's graduating Ph.D. students
got jobs designing codecs: Haque
joined American Microsystems, followed by Ahuja and Rahim joining
Bell Labs in succession.
Switched-capacitor filters quickly became a hot research topic
throughout industry and academia.
At the University of Toronto, where
I did my master's work, Ph.D. student Ken Martin (who had worked
on switched-capacitor filters at BNR)
and Prof. Adel Sedra were making
major contributions to the subject.
Their work helped spark my interest
in the topic. After I worked briefly
in industry, Miles convinced me to
return to Carleton to study highfrequency switched-capacitor filters
as a Ph.D. student in 1981. Miles assured me this topic was "a thesis on
a silver platter," one of his favorite
expressions, so I went for it.
My first task was characterizing
an
N-channel MOS switched-capacitor filter Miles designed at the
General Electric (GE) R&D center in
upstate New York. The filter was designed to operate at relatively high
sample rates and consequently had
wide MOS switches for low on resistance. The filter was single ended,
as was the practice at the time,
and had significant offsets due to
the charge injection of the large
switches. I found a way to use a second filter chip to cancel the offset
and also learned that neither free
lunches nor silver platters were
abundant. Figure 2 shows Miles and
Research Engineer Duncan Glendinning in 1984 and the Corvus system they developed at Carleton for
CMOS IC design.
After finishing the switched-capacitor filter characterization, Miles introduced me to some of his colleagues
at GE and arranged for financial support and access to GE's advanced
CMOS technology. During 1983-1984,
I made frequent visits to GE to work
on my thesis and consult on an AM/
FM radio project, and they were very
IEEE SOLID-STATE CIRCUITS MAGAZINE
W I N T E R 2 0 16
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Table of Contents for the Digital Edition of IEEE Solid-State Circuits Magazine - Winter 2016
IEEE Solid-State Circuits Magazine - Winter 2016 - Cover1
IEEE Solid-State Circuits Magazine - Winter 2016 - Cover2
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IEEE Solid-State Circuits Magazine - Winter 2016 - Cover3
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