An Efficient Sigma-Delta ADC Architecture for Low Oversampling Ratios(by Temes)

semico_ljj

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS—I: REGULAR PAPERS, VOL. 51, NO. 1, JANUARY 2004 63
An Efficient Sigma-Delta ADC Architecture for Low Oversampling Ratios
János Márkus, Student Member, IEEE, and Gabor C. Temes, Life Fellow, IEEE

Abstract—As the demand for Sigma-Delta (Delta-Sigma) analog-to-digital
converters (ADCs) with higher bandwidth and higher
signal-to-noise ratio (SNR) increases, designers have to look
for efficient structures with low oversampling ratio (OSR). The
Leslie-Singh or –0 MASH architecture is often used in such
applications. Based on this architecture, a reduced-sample-rate
structure was introduced, which needs less chip area and power,
but increases the noise floor. This paper describes a modification
of the reduced-sample-rate structure which realizes an optimized
transfer function, and avoids an SNR loss. In fact, it increases the
SNR for high-order modulators. The method can also be applied
to one-stage modulators. Simulation results for different MASH
ADCs and sensitivity analysis verify the usefulness of the proposed
technique.

Index Terms—Leslie–Singh, MASH, modified (rotated)
sinc-filter, multistage delta-sigma modulator, optimized noise
transfer function, reduced-sample-rate.

[ 本帖最后由 semico_ljj 于 2006-11-30 13:27 编辑 ]

semico_ljj

Gabor C. Temes (SM’66–F’73–LF’98) received his
undergraduate education at the Technical University
and Eötvös University in Budapest, Hungary, from
1948 to 1956, and the Ph.D. degree in electrical engineering
from the University of Ottawa, Ottawa, ON,
Canada, in 1961. He received an honorary doctorate
from the Technical University of Budapest, Budapest,
Hungary, in 1991.
He held academic positions at the Technical University
of Budapest, Stanford University, Stanford,
CA, and the University of California at Los Angeles
(UCLA), and worked in industry at Northern Electric R&D Laboratories (now
Bell-Northern Research), as well as at Ampex Corporation. He is now a Professor
in the Department of Electrical and Computer Engineering at Oregon
State University (OSU), Corvallis. He served as Department Head at both UCLA
and OSU. He is coeditor and coauthor of Modern Filter Theory and Design
(New York:Wiley, 1973), coauthor of Introduction to Circuit Synthesis and Design
(New York: McGraw-Hill, 1977), coauthor of Analog MOS Integrated Circuits
for Signal Processing (New York:Wiley, 1986), and coeditor and coauthor
of Oversampling Delta-Sigma Data Converters (New York: IEEE Press, 1992)
and Delta-Sigma Data Converters (Piscataway, NJ: IEEE Press, 1997), as well
as a contributor to several other edited volumes. He has published approximately
300 papers in engineering journals and conference proceedings. His recent research
has dealt withCMOSanalog integrated circuits, as well as data converters
and integrated sensor interfaces.
Dr. Temes is a Life Fellow of the IEEE. He was Associate Editor of the
Journal of the Franklin Institute, Editor of the IEEE TRANSACTIONS ON CIRCUIT
THEORY and Vice President of the IEEE Circuits and Systems (CAS) Society.
In 1968 and in 1981, he was co-winner of the CAS Darlington Award, and in
1984 winner of the Centennial Medal of the IEEE. He received the Andrew Chi
Prize Award of the IEEE Instrumentation and Measurement Society in 1985,
the Education Award of the IEEE Circuits and Systems Society in 1987, and
the Technical Achievement Award of the same Society in 1989. He received the
IEEE Graduate Teaching Award in 1998, and the IEEE Millennium Medal as
well as the IEEE CAS Golden Jubilee Medal in 2000.

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