TEXASA&MUNIVERSITY
Department of Electrical Engineering
College Station, Texas77843-3128
TEL (409) 845-7498 FAX (409) 845-7161
S E M I N A R
Room 223A ZEC
Tuesday, November 8, 2005, 3:55 p.m. - 5:10 p.m.
An 11-Band 3.4 to 10.3 GHz MB-OFDM UWB
Receiver in 0.25um SiGe BiCMOS
by
Alberto Valdes-Garcia
Analog & Mixed-Signal Center, TexasA&MUniversity
Abstract: The Multi-Band OFDM (MB-OFDM) proposal for UWB communications hasreceived significant attention as an option for the implementation of very high data rate (up to 480Mb/s) wireless devices. This approach uses frequency bands of 528MHz with OFDM-QPSK modulation and fast hopping between the bands of a given band group. This seminar presents a MB-OFDM UWB receiver that enables high speed data transmission in 11 bands clustered in 4 band groups according to a proposed bandplan. The key features of the receiver IC include a differential RF front-end with rejection to interference at 5.25GHz and a 3.7-10GHz UWB frequency synthesizer with fast hopping capability. The IC is implemented in a 0.25um BiCMOS technology with a peak fT of 47GHz and its performance is measured in a QFN package mounted on a standard FR-4 substrate making it a low cost solution. Up to our knowledge, this is the first 3-10GHz MB-OFDM UWB receiver and the first UWB receiver operating beyond 5GHz demonstrated in package.
Alberto Valdes-Garcia Born in 1978, grew up in San Mateo Atenco, Mexico. He received the B.S. in Electronic Systems Engineering degree from the Monterrey Institute of Technology (ITESM), Campus Toluca, Mexico in 1999 (Highest Honors). Since the fall of 2000 he has been working towards the Ph.D. degree in Electrical Engineering at the Analog and Mixed-Signal Center (AMSC), TexasA&MUniversity. In 2000 he was a Design Engineer with Motorola, Broadband Communications Sector. From 2001 to 2004 he was a Semiconductor Research Corporation (SRC) research assistant at the AMSC working on the development of analog and RF built-in testing techniques. In the summer of 2002 he was with the Read Channel Design Group at Agere Systems where he investigated wide tuning range GHz LC VCOs for mass storage applications. During the summer of 2004 he was with the Mixed-Signal Communications IC Design Group at the IBM T. J. Watson Research Center, where worked on the design and analysis of millimiter-wave SiGe power amplifiers. His present research involves system-level and RF circuit design for Ultra Wideband (UWB) communications. From the fall of 2000, Alberto has been the recipient of a scholarship from the Mexican National Council for Science and Technology (CONACYT). He is the winner of the 2005 IEEE Test Technology Technical Council (TTTC)Best Doctoral Thesis Award.