Tutorial 1: Design of Continuous-Time Filters from 0.1 Hz to 2.0 GHz


Edgar Sánchez-Sinencio; Texas A&M University
José Silva-Martínez; Texas A&M University

Time & Location

Sunday Morning, May 23, 08:30 - 11:30, Location: Junior Ballroom C


The bipolar transconductance amplifier (OTA) was commercially introduced in 1969 by RCA. Designers began using OTAs in the middle 80's, since then the CMOS-OTA is becoming a vital component in a number of electronic circuits, both in open loop and in closed loop applications. Continuous-time filters implemented with transconductance amplifiers and capacitors known as Gm-C or OTA-C are very popular for a host of applications. These applications involve frequency of operation from a few tents of a hertz up to several gigahertz. Several of those applications are in medical electronics and seismic area where the frequency range is between 0.1Hz up to 100Hz. Other applications in the audio range do not commonly use OTA-C filters because switched-capacitor techniques excel in this range. But for frequency range of a few MHz like in Intermediate Frequency (IF) filters in RF receivers OTA-C implementations are very attractive; read/write channels for hard disk drives, data communication equalizers and adaptive systems most of the read channel devices are based on OTA-C filters as well. For a few GHz range applications where the OTA becomes a simple differential pair there is a number researchers investigating LC-oscillators and filters.

In this tutorial we discuss practical implementations of transconductance amplifiers oriented for wide range of applications for example in medical, IF filters, hard disk drive linear phase filters, LC-oscillators and RF filters. Furthermore the unavoidable tuning scheme to compensate the Gm/C deviations due to process technology variations is discussed. OTA single ended, fully differential and pseudo differential versions are introduced together with the common-mode feedback circuits needed for proper operation of differential architectures.

Presenter Information

Edgar Sánchez-Sinencio (S'72-M'74-SM'83-F'92) received the degree in communications and electronic engineering (Professional degree) from the National Polytechnic Institute of Mexico, Mexico City, in 1996, the M.S.E.E. degree from Stanford University, Stanford, CA, in 1970, and the Ph.D. degree from the University of Illinois at Urbana-Champaign in 1973. From 1976 to 1983, he was the Head of the Department of Electronics at the Instituto Nacional de Astroffsica, Optica y Electrónica (INAOE), Puebla, Mexico. He was a Visiting Professor in the Department of Electrical Engineering at Texas A&M University, College Station, during the academic years of 1979-1980 and 1983-1984. He is currently the TI J. Kilby Chair Professor and Director of the Analog and Mixed-Signal Center at Texas A&M University. He was the General Chairman of the 1983 26th Midwest Symposium on Circuits and Systems. He is coauthor the book Switched Capacitor Circuits (New York: Van Nostrand-Reinhold, 1984) and coeditor of the book Low Voltage/Low Power Integrated Circuits and Systems (Piscataway, NJ: IEEE Press, 1999). His present interests are in the area of RF-communication circuits and analog and mixed-mode circuit design.

Dr. Sánchez-Sinencio was an AssociateEditor for IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS (1985-1987) and an Associate Editor for the IEEE TRANSACTIONS ON NEURAL NETWORKS. He is the former Editor-in-Chief of the IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II. He is a former President of the IEEE Circuits and Systems Technical Committee on Neural Systems and Applications and CAS Technical Committee on Analog Signal Processing. In November 1995, he was awarded a Honoris Causa Doctorate by the National Institute for Astrophysics, Optics and Electronics, Mexico, the first honorary degree awarded for Microelectronic Circuit Design contributions. He received the 1995 Guillemin-Cauer for his work on Cellular Networks. He is a former IEEE CAS Vice President-Publications. He was also the corecipient of the 1997 Darlington Award for his work on high-frequency filters. He received the Circuits and Systems Society Golden Jubilee Medal in 1999. He was the IEEE Circuits and Systems Society representative to the Solid-Sate Circuits Society (2000-2002). He is currently a member of the IEEE Solid-State Circuits Award Committee.

José Silva-Martínez (SM'98) received the B.S. degree in electronics from the Universidad Autónoma de Puebla, México, in 1979, the M.Sc. degree from the Instituto Nacional de Astrofísica Optica y Electrónica (INAOE), Puebla, México, in 1981, and the Ph.D. degree from the Katholieke Univesiteit Leuven, Leuven Belgium in 1992.

From 1981 to 1983, he was with the Electrical Engineering Department, INAOE, where he was involved with switched-capacitor circuit design. In 1983, he joined the Department of Electrical Engineering, Universidad Autónoma de Puebla, where he remained until 1993. In 1993, he re-joined the Electronics Department, INAOE, and from May 1995 to December 1998, was the Head of the Electronics Department; He was a co-founder of the Ph.D. program on Electronics in 1993. He is currently with the Department of Electrical Engineering (Analog and Mixed Signal Center) Texas A&M University, at College Station, where He holds the position of Associate Professor. His current field of research is in the design and fabrication of integrated circuits for communication and biomedical application.

Dr. Silva-Martínez has served as IEEE CASS Vice President Region-9 (1997 - 1998), and Associate Editor for IEEE Transactions on Circuits and Systems part-II from 1997-1998 and May 2002 till present. He is the inaugural holder of the TI Professorship-I in Analog Engineering, Texas A&M University. He was a co-recipient of the 1990 European Solid-State Circuits Conference Best Paper Award.

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