Thursday, May 10, 2007
IEEE Circuits and Systems, Dallas Chapter:   Seminar
 
https://ewh.ieee.org/soc/cas/dallas/ 
 

Title : Frequency-Domain-Sampling Receivers for Broadband Communication Systems

Presenter :  Dr. Sebastian Hoyos , Assistant Professor, Texas A&M University, College Station, TX

Date : Thursday May 10, 2007. 6:30pm, Refreshments - Pizza & Drinks ; 7:00pm, Program

Location : Dallas Texins Activities Center, Conf Room 1 (North end of  Texas Instruments expressway site, 13900 N Central Expw.; site  entrance on north-bound access road, between Midpark Rd. & Spring Valley Rd.)

Abstract:

Digital intensive RF receiver front-ends have became a successful solution for narrow band systems such as GSM and Bluetooth. Calibration of switched Gm-C filters together with charge redistribution is some of the key enabling schemes in these receiver topologies.

This seminar presents the most recent advances of these techniques for broadband systems applications such as Wi-Max, UWB, etc. The proposed new schemes allow for parallel frequency-domain sampling using simple topologies of Gm-C switched filters. The ADCs that follow this receiver front-end topology operate at a fraction of the Nyquist rate which saves power in comparison with a single channel topology. More power savings are achieved by lowering the switching times of the CMOS switches. Robustness to noise and jitter is achieved by various techniques such as signal overlapping, slight over-sampling and averaging in the switching times. Additionally, we show statistical signal processing techniques to achieve background calibration of the mixers, local oscillators, integrators and ADCs. Some examples of how these joint signal/circuit processing techniques can be used in real broadband communications systems using multi-carrier and direct-sequence signals will be illustrated.

Brief Biography

Sebastian Hoyos was born in Cali, Colombia in 1975. He received the B.S. degree from the Pontificia Universidad Javeriana (PUJ), Bogota, Colombia in 2000, and the M.S. (2002) and Ph.D. (2004) degrees from the University of Delaware, Newark DE, all in electrical engineering. He worked for Lucent Technologies Inc. from 1999 to 2000 as Technical Manager and Sales Engineer for the Andean region in South America. Simultaneously, he was an Adjunct Professor at the PUJ University, where he lectured on microelectronics and control theory. In the Fall of 2000, he enrolled in the Department of Electrical and Computer Engineering at University of Delaware. During his master and Ph.D. studies, he worked under the PMC-Sierra Inc., the Delaware Research Partnership Program, and the Army Research Laboratory (ARL) Collaborative Technology Alliance (CTA) in Communications and Networks. In the Fall of 2004, he enrolled in the Department of Electrical Engineering and Computer Sciences at the University of California, Berkeley, where he was a postdoctoral researcher at the Berkeley Wireless Research Center. He has carried out industrial consulting with Conexant Systems Inc., Red Bank, NJ. He is a now an Assistant Professor at the Department of Electrical and Computer Engineering at the Texas A&M University, College Station, TX. His research interests include communication systems, wireless communications, robust signal processing, and mixed-signal high-speed systems and circuit design. For a complete list of his publications and patents, please visit https://www.ee.tamu.edu/~hoyos/.