TEXAS A&M UNIVERSITY Department of Electrical Engineering Col l ege St at i on, Texa s 7843-3128 TEL (409) 845-7 498 FA X (409) 845- 161 sa nc hez @e e ta m u.edu ht :/ / am sc ta mu edu/ SEMINAR 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, Texas A&M University Abstract: The Multi-Band OFDM (MB-OFDM) proposal for UWB communications has received 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 band groups according to a proposed band plan 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), Texas A&M University 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