April 14, 2008
Interschool Lab, Room 750 CEPSR
Speaker: Babak Heydari, Berkeley Wireless Research Center, UC Berkeley
In the new order of the wireless world, the emerging area of "short distance wireless" promises tremendous opportunities for innovation. The area covers various applications depending on their data rate and power requirements. On one side of the spectrum lie ultra high frequency/high data rate systems. The popularity of high quality video content and multimedia mobile devices with tens of Gigabytes of embedded memory creates a demand for multi Gbps wireless data transfer solutions achievable with the proper cost and power budget. The availability of the 60GHz band and the improved performance of CMOS technology as a result of scaling have made mm-wave CMOS the main candidate to serve this application. In the last few years, new applications such as low cost medical imaging systems have also encouraged exploiting silicon technology at sub-THz frequencies posing many new challenges for circuit designers. The other side of the spectrum is created based on applications such as item level RFID and real time health monitoring through wireless medical implants. These applications motivate investigating ultra low power (sub microwatt), low data rate wireless nodes for short distance dense networks.
In this talk, design strategies and some examples of pushing CMOS to operate at sub-THz region will be presented. This includes optimization and modeling of CMOS devices, several circuit blocks with record performances at 60 and 100+ GHz and some device/circuit co-design techniques to improve the performance of the technology and reduce the power dissipation. The talk will also present a sub microwatt wireless node for RFID applications implemented at TagArray Co. The system is electromagnetically powered and unlike conventional RFID systems utilizes a stand-alone UWB transmitter.
Babak Heydari received his B.S. in electrical engineering with a minor in chemistry from the Sharif University of Technology in 2002. In 2003 he started his graduate studies in the University of California at Berkeley by first joining BSIM group where he was a part of the team who developed the new generation of BSIM model, BSIM5 for nano-scale CMOS transistors. Since January 2005 he has been a part of millimeter-wave CMOS project in Berkeley Wireless Research Center (BWRC) where he is currently doing his Ph.D.Since summer 2007, Mr. Heydari has been collaborating with TagArray Co., Los Altos, as a part of a team to develop a new generation of RFID tag systems. Mr. Heydari received the certificate for management of technology (MOT), a joint program between Berkeley Haas School of Business and College of Engineering in December 2006. He was a gold medal winner of national chemistry competition in 1997.