[Quantum-ms] [ee-faculty] [EE Seminar] 4/11: Design of Robust Frequency Generation and Modulation Circuits for Low-Voltage Mobile IoT

[Mingoo Seok]

Dear Colleagues,

A gentle reminder about the seminar this Friday.

Best!
Mingoo

On Tue, Mar 11, 2025 at 1:51 PM Columbia EE Events <
ee-events at ee.columbia.edu> wrote:

> *Please join us for EE Seminar on 4/11!*
>
> *Date: *4/11, 2-3pm
> *Location: *EE conference room
> *Who: *Woogeun Rhee
> *Title: *Design of Robust Frequency Generation and Modulation Circuits
> for Low-Voltage Mobile IoT
> <https://www.ee.columbia.edu/events/ee-seminar-design-robust-frequency-generation-and-modulation-circuits-low-voltage-mobile-iot >
>
> *Abstract:*
> As future wireless systems utilizing advanced CMOS technology demand not
> only low power but also low-voltage design, robust frequency generation and
> modulation have become more crucial than ever. In particular, sub-0.5V
> frequency synthesis and modulation are essential for enabling battery-free
> operation in mobile IoT devices, as they can be directly powered by energy
> harvesters without the need for additional DC-DC converters. However,
> designing a low-voltage fractional-N PLL is highly challenging, as both
> matching and linearity degrade significantly when the supply voltage is
> scaled down. The first part of this talk will discuss the extensive use of
> a 1-bit ΔΣ modulation method to develop robust frequency modulation systems
> by mitigating nonlinearity issues. Then, a low-voltage BLE transmitter
> based on a bias-current-free hybrid fractional-N PLL with voltage-mode
> phase detection will be presented. Lastly, other energy-efficient wideband
> transceiver designs from my research group will be briefly introduced.
>
> *Biography:*
> Woogeun Rhee received the B.S. degree in electronics engineering from
> Seoul National University, Seoul, Korea, in 1991, the M.S. degree in
> electrical engineering from the University of California, Los Angeles, CA,
> USA, in 1993, and the Ph.D. degree in electrical and computer engineering
> from the University of Illinois, Urbana-Champaign, IL, USA, in 2001.
>
> From 1997 to 2001, he was with Conexant Systems (now Skyworks), Newport
> Beach, CA, USA, where he was a Principal Engineer and developed low-power,
> low-cost fractional-N synthesizer products. From 2001 to 2006, he was with
> IBM Thomas J. Watson Research Center, Yorktown Heights, NY, USA, and worked
> on clocking area for high-speed I/O serial links. He was a Visiting
> Professor at Seoul National University, Korea, from August 2022 to February
> 2023. He is currently a Professor with the School of Integrated Circuits,
> Tsinghua University, Beijing, China. He has published more than 180 IEEE
> papers and holds 24 U.S. patents. His research interests include
> energy-efficient short-range radios for mobile IoT, UWB transceivers for
> secure wireless connectivity, and mixed-signal circuits including
> phase-locked loops.
>
> Dr. Rhee currently serves as the Editor-in-Chief for IEEE OJ-SSCS. He has
> served on the AdCom of the IEEE Solid-State Circuits Society and the BoG of
> the IEEE Circuits and Systems Society, as a SSCS Representative. He was an
> SSCS Chapters Steering Committee Member from 2021 to 2023, a Distinguished
> Lecturer from 2016 to 2017, and an Associate Editor for OJ-SSCS, JSSC, and
> TCAS-II. He has served on the TPC for IEEE conferences, including ISSCC,
> CICC, and A-SSCC. He was the TPC Chair of A-SSCC 2021 and has been the
> Steering Committee Member of A-SSCC. He is an IEEE Fellow.
>
> *Faculty Host:* Mingoo Seok
>
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