IEEE Solid-State Circuits Magazine - Winter 2016 - 33

less noise to potentially leak into the
output when there is mismatch or finite gain. I used a similar architecture
in my subsequent work on cascaded
sigma delta modulators to good effect
[5]. One of the circuits from my Ph.D.
work employed a differential switching switched-capacitor integrator circuit proposed by Miles. Several years
later, I used a variant of this circuit,
which operated at double rate on a
two-phase clock, in a low-noise, lowdrift 20-bit sigma-delta modulator [6],
which was successfully designed into
the data-acquisition system of several
generations of GE CT medical imagers.
After joining Analog Devices in
1994, I moved into wireline and subsequently wireless modem development, and my work diverged from
that of Miles. However, we kept in
touch, and I followed his progress in
sigma-delta fractional-N synthesizers
and direct Gaussian minimum-shift
keying modulators with admiration.
In fact, several RF products from Analog Devices incorporated these circuit
techniques. Now that Miles is retired, I
miss hearing about his latest insights
and accomplishments and reading his
IEEE papers. The good news, however,
is that since retiring, Miles has sailed
the Atlantic coast several times with
his wife Margaret on their boat Smiles,
and he has time to enjoy the company
of his grandchildren. Figure 5 is a 2008
photo of Miles and Margaret with me.
Whether he's flying a plane beyond the
speed of sound, working on the cutting
edge of technology, or sailing the seas,
Miles has a taste for adventure and is
an inspiration to all who know him.

References

[1] J. T. Caves, M. A. Copeland, C. F. Rahim,
and S. Rosenbaum, "Sampled analog
filtering used switched-capacitors as
resistor equivalents," IEEE J. Solid-State
Circuits, vol. SC-12, no. 6, pp. 592-599,
Dec. 1977.
[2] B. J. Hosticka, R. W. Broderson, and P. R.
Gray, "MOS sampled data recursive filters
using switched capacitor integrators,"
IEEE J. Solid-State Circuits, vol. SC-12, no.
6, pp. 600-608, Dec. 1977.
[3] D. B. Ribner and M. A. Copeland,
"Biquad alternatives for high-frequency
switched-capacitor filters," IEEE J. SolidState Circuits, vol. 20, no. 6, pp. 1085-
1095, Dec. 1985.
[4] L. Longo and M. A. Copeland, "A 13-bit
ISDN-band ADC using two-stage third

X

+
-

Σ

+
-

Σ

D

D

+
-

Σ

+
-

Σ

D

D
D2

D1

(1 - D)2

D
Σ
D0

Figure 4: A third-order sigma delta modulator comprising cascaded second-order and
first-order stages [4].

Figure 5: Miles and Margaret with the author in 2008.
order noise shaping," in Proc. IEEE Custom Integrated Circuits Conf, June 1988,
pp. 21.2.1-4.
[5] D. B. Ribner, R. D. Baertsch, S. L. Gaverrick, D. T. McGrath, J. E. Krisciunas, and
T. Fujii, "A third-order multistate sigma
delta modulator with reduced sensitivity to nonidealities," IEEE J. Solid-State
Circuits, vol. 26, no. 12, pp. 1764-1774,
Dec. 1991.
[6] D. B. Ribner, "Double-rate sampled-signal integrator," U.S. patent 5,392,043, 21
Feb. 1995.

About the Author
David B. Ribner (dave@tune-bot.
com) received the Ph.D. degree
in 1986 from Carleton University,
where he was a student of Prof. Miles
A. Copeland. He designed a variety of
filters, amplifiers, analog-to-digital

converters, digital-to-analog converters, analog front-ends, and
digital signal processors at several
companies including Bell Labs and
GE. From 1994 to 2012 he was with
Analog Devices where he led the development of ADSL, cable modems,
and Wi-Fi chips and chip sets. He is
currently the president of Overtone
Labs, a consumer electronics company he founded with his two sons in
2012. Products from Overtone Labs
are available in music stores in over
40 countries.

IEEE SOLID-STATE CIRCUITS MAGAZINE

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