Talk by Dr. Anto Davis

Location: Auditorium, First floor, ESE Department

Title        : New Designs in EMC

Speaker : Dr. Anto Davis

Date       : Friday, August 30, 2019

Time       : 4:00 pm – 5:00 pm  (Tea/Coffee at 3:45 pm)

Venue    : Auditorium, First floor, ESE Department

The ever-increasing use of electronic products makes it important for diverse circuits to operate in close proximity to each other. Today’s electronic products need to work not only in ideal laboratory conditions, but also in the real world with other devices nearby, and to comply with government electromagnetic compatibility (EMC) regulations. Both switching power supplies and microprocessors are known to cause electromagnetic interference (EMI) noise in electronic systems due to their fast switching nature. A step-down DC-DC converter is used to produce lower voltage from a DC supply.  Nowadays, GaN switches are gaining popularity in the 48V to 1V buck converters (inductor based step-down DC-DC converters) due to their high efficiency and switching speed. 48V to 1V converters are the most sought-after converter topology in automotive electronics and server motherboard designs.

This talk discusses two new concepts in EMC.  First one is a method to isolate the conducted noise from a microprocessor. The possible future applications of the concepts in GaN converters are also discussed. Second is a method to assess the radiated noise from power inductor used in buck converter. Radiated EMI from the inductors of a buck converter is a common cause of EMC failure.  The proposed design strategy can be used during design phase itself to assess the possible worst case radiated EMI from a buck converter. A 4-phase system in package (SiP) 100 MHz buck converter is taken as an example to show the proposed design strategy. Ansys HFSS is used to obtain the radiated noise from the inductors. The concepts can be used in any DC-DC converters to study the worst case radiated noise from inductors.

Anto K Davis received a B.Tech. degree in Electrical and Electronics Engineering from the National Institute of Technology Trichy, India, in 2006; M.Tech. and Ph.D. degrees in Electronics Design from the Indian Institute of Science, Bangalore, India, in 2010 and 2015 respectively. He was employed by Huawei Technologies, Bangalore, India, from 2006 – 2007, and by Brocade Communications, Bangalore, India, in 2010. He served as a postdoctoral researcher at the School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, USA, from January 2016 to December 2017. His postdoctoral research was funded by Power Delivery for Electronic Systems (PDES) consortium in the Center for Co-design of Chip, Package, Systems (C3PS).  He is currently working as a Senior Technology Strategist at Picotest in Bangalore, India (since January 2018).
His Ph.D. research addressed noise reduction techniques for microprocessor – power distribution networks (PDN), and methods to suppress anti-resonance peaks. His post-doctoral research at the Georgia Institute of Technology, focused primarily on two projects:
1) 100 MHz on-package integrated voltage regulator (IVR) for processors
2) RF wireless power transfer with on-package switching regulators for Internet of Things
Dr. Davis is also a member of the IEEE P370 standardization committee – “Electrical Characterization of Printed Circuit Board and Related Interconnects at Frequencies up to 50 GHz”.  His current research interests include electromagnetic compatibility (EMC), power integrity measurements, GaN DC-DC converters, and EMC issues in wireless power transfer.

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