Spring 2016: Upcoming Seminars

  • Title: Digital Transmitter Revolution: From Polar to Multiphase SCPAs
          Speaker: Prof. Jeffrey S. Walling
  •       Date: Friday, Oct. 14th, 2pm, 414 CEPSR

  • Title: Analog/Mixed-Signal Circuit Design in Nanoscale CMOS
          Speaker: Dr. William Yee Li
  •       Date: Friday, Nov. 18th, 2pm, TBD

  • Title: Needle in a haystack - How to Find Hidden Parasitics in mm-Wave Layouts
          Speaker: Dr. Shahriar Shahramian
  •       Date: Friday, Dec. 2nd, 2pm, TBD

    Prof. Aarno Parssinen
    University of Oulu
    Wednesday, Aug. 31st, 2:00pm-3:00pm
    627 Mudd
    New system concepts stretching the requirements of RFICs

    Implementation constraints coming from RFIC technologies and other RF components set boundary conditions for new radio systems that try to stretch data rates, power consumption, cost and range to new extremes. Some of these techniques may be absolutely needed for optimal solutions but in many cases achieving sufficient performance in the extreme conditions may challenge research community for a long time. Requirements against RFIC solutions are evaluated using selected examples of existing wireless systems as well as looking forward to some of the key design aspects towards 5G.

    Aarno Parssinen received the M.Sc., Licentiate in Technology, and Doctor of Science degrees from the Helsinki University of Technology, Espoo, Finland, in 1995, 1997, and 2000, respectively, all in electrical engineering.
    In 1996, he was a Research Visitor at the University of California at Santa Barbara. From 2000 to 2011, he was with Nokia Research Center, Helsinki, Finland. During 2009-2011, he served as a member of Nokia CEO Technology Council. From 2011 to 2013, he was with Renesas Mobile Corporation, Helsinki, working as a Distinguished Researcher and RF Research Manager. In 2013, as part of business acquisition, he joined Broadcom, Helsinki. Currently, he is a Professor at the University of Oulu, Finland.
    His research interests include wireless systems and transceiver architectures for wireless communications, with special emphasis on the RF and analog integrated circuit and system design. He has authored and co-authored one book, one chapter of a book, and more than 50 international journal and conference papers, and he is the holder of several patents. He has served as a member of the Technical Program Committee of Int. Solid-State Circuits Conference since 2007, and he is currently the Chair of the Wireless Subcommittee.

    Prof. Jeffrey S. Walling
    University of Utah
    Friday, Oct. 14th, 2:00pm-3:00pm
    414 CEPSR
    Digital Transmitter Revolution: From Polar to Multiphase SCPAs

    CMOS is ubiquitous for computation, and as such plays an ever increasing role in our lives as we use computation to improve working efficiency. Increasing levels of integration have made it possible to embed analog and RF circuits with digital processing to create RF systems-on-chip. The RF PA has been the exception to integration in CMOS, owing to relatively poor performance (e.g., low peak output power and low energy efficiency) when compared to other semiconductor technologies (e.g., III-V compounds, GaN and SiGe). In this talk the switched capacitor PA (SCPAs) is introduced. It leverages CMOS inherent strengths of fast switching and lithographic matching to yield a linear, efficient digital PA. The original SCPA was a polar PA, subject to significant system level non-linearity (wide bandwidth, lack of synchronization, etc). I will introduce several techniques that implement SCPAs in discrete phase spaces; several multiple phase digital PA architectures will be discussed that alleviate the need for wideband phase modulators and synchronization. I will highlight several recent examples from the University of Utah PERFIC lab's research with applications of the multiphase techniques to the SCPA.

    Dr. Walling received the B.S. degree from the University of South Florida, Tampa, in 2000, and the M.S. and Ph. D. degrees from the University of Washington, Seattle, in 2005 and 2008, respectively. He was employed at Motorola, Plantation, FL working in cellular handset development. He interned for Intel from 2006-2007, working on highly-digital transmitters and CMOS PAs and continued this research while a Postdoctoral Researcher at the University of Washington. He is currently an assistant professor in the ECE department at University of Utah. His current research focuses on high-efficiency digital transmitters for MIMO. Dr. Walling has authored ~50 journal articles conference papers and holds four patents. He received the Outstanding Teaching Award at University of Utah in 2015, the HKN Award for Excellence in Teaching in 2011, Best Paper Award at Mobicom 2012, the Yang Award for outstanding graduate research from the EE Department at University of Washington in 2008, an Intel Predoctoral Fellowship in 2007-2008, and the Analog Devices Outstanding Student Designer Award in 2006.

    Dr. William Yee Li
    Friday, Nov. 18th, 2:00pm-3:00pm
    Analog/Mixed-Signal Circuit Design in Nanoscale CMOS

    As CMOS technology scales, transistor density and speed increase resulting in more energy-efficient CPU and SOC. To interface among the powerful digital machines or with the physical world, analog/mixed-signal circuits play the critical role. However, aggressively scaled CMOS is not always analog friendly. To name a few but not all, the ever-decreasing voltage headroom, lower output impedance and higher variation seen in tiny transistors are undesirable characteristics. This talk will present several designs in phase-locked loop and temperature sensor in 22nm and 14nm, how design challenges are addressed and future directions.

    William Li received his Bachelor degree from The University of Hong Kong, M.S. and Ph.D. from Columbia University. He has been focusing on analog/mixed-signal circuit and system at Intel, conducting R&D in the latest process technologies in 65, 45, 32, 22, 14nm and beyond. His current research interests cover phase-locked loops, smart sensors, ADCs, and dc-dc converters.

    Dr. Shahriar Shahramian
    Nokia-Bell Lab
    Friday, Dec. 2nd, 2:00pm-3:00pm
    Needle in a haystack - How to Find Hidden Parasitics in mm-Wave Layouts

    This short course explores the hidden impairments which are often overlooked or difficult to locate in mm-Wave layouts and interconnects. Using real-life fabricated circuit blocks operating in the W-Band and optical circuits operating beyond 100Gb/s you are invited to search for parasitic capacitive, inductive and resistive elements which can adversely affect the circuit performance. After modeling of these elements, simulations demonstrate the impact of the parasitics on bandwidth, center frequency, stability and noise-figure. Using simple and quick modeling techniques the designers can incorporate various layout effects into their design.

    Shahriar Shahramian (M '06) received his Ph.D. degree from University of Toronto in 2010 where he focused on the design of mm-wave data converters and transceivers. Dr. Shahramian has been with the Bell Laboratories division of Alcatel-Lucent (now Nokia), Murray Hill, NJ since 2009 and is currently the Director of the mm-Wave ASIC Research Department. He is also a member of the technical program committee of Compound Semiconductor Integrated Circuit Symposium. His research focus includes the design of mm-wave wireless and wireline integrated circuits. He is the lead designer of several state-of-the-art ASICs for optical coherent and wireless backhaul product development at Bell Laboratories. Dr. Shahramian has been the recipient of Ontario Graduate Scholarship, University of Toronto Fellowship and the best paper award at the CSIC Symposium in 2005, 2015 and RFIC Symposium in 2015. He has also held an adjunct associate professor position at Columbia University, has received several teaching awards and is the founder and host of The Signal Path educational video series.

    Spring 2016 Seminars

  • Title: New system concepts stretching the requirements of RFICs
          Speaker: Prof. Aarno Parssinen
  •       Date: Wednesday, Aug. 31st, 2pm, 627 Mudd

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