[CSEE Talk] talk: Efficient Energy Delivery for Low Power IoT Devices, 11am Fri 3/4, UMBC

[Tim Finin]

          Efficient Energy Delivery for Low Power IoT Devices

         Khondker Zakir Ahmed, Georgia Institute of Technology

               11:00-12:00 Friday, 4 March 2016, ITE325b

Low power IoT Devices are growing in numbers and by 2020 there will be
more than 25 Billion of those in areas such as wearables, smart homes,
remote surveillance, transportation and industrial systems, including
many others. Many IoT electronics either will operate from stand-alone
energy supply (e.g., battery) or be self-powered by harvesting from
ambient energy sources or have both options. Harvesting sustainable
energy from ambient environment plays significant role in extending
the operation lifetime of these devices and hence, lower the
maintenance cost of the system, which in turn help make them integral
to simpler systems. Both for battery-powered and harvesting capable
systems, efficient power delivery unit remains an essential component
for maximizing energy efficiency.

In this talk, I will discuss some of the most pressing challenges of
energy delivery for low power electronics considering both energy
harvesting as well as battery-powered conditions. Design techniques
for very high conversion ratio, bias current reduction with autonomous
bias gating, battery-less cold start, component and power stage
multiplexing for reconfigurable and multi-domain regulators will be
discussed. I will also present a highly integrated autonomous imaging
system featuring a dual-purpose CMOS image sensor that is capable of
both imaging and harvesting. This talk will focus only on the energy
harvesting and power delivery aspect of this imaging system;
presenting 'a single inductor, single input, four output'power
delivery unit with maximum power point tracking and prioritized output
voltages. I will also present some silicon results from prototype
chips developed in 130nm CMOS.

I will conclude the talk by discussing my vision of research on how
low power analog electronics will play significant roles in realizing
tomorrow's ultra-low power, yet highly complex and smart electronic
systems.   


Khondker Zakir Ahmed is a PhD candidate in the School of Electrical
and Computer Engineering at Georgia Institute of Technology, Atlanta,
GA, where he works with the supervision of Professor Saibal
Mukhopadhyay. He has received his MS in ECE from Georgia Tech in 2015
and BSc in EEE from Bangladesh University of Engineering and
Technology in 2004. His primary research focus is power delivery
circuit and systems design, specifically focused on low power
electronics. His research accomplishments include innovative bias
current reduction mechanism (Best in Session award, SRC TECHCON 2014),
On-chip controller design for TEG/TEC for joint energy harvesting and
hot-spot cooling (Best paper award, ISLPED 2014) and high conversion
ratio hybrid down-converting regulator (Best in Session award, SRC
TECHCON 2015).  Khondker enjoys teaching; he has been a guest lecturer
in several courses at Georgia Tech, and was a lecturer in the
Department of Electrical and Electronic Engineering at East West
University in Dhaka, Bangladesh for over a year before coming to
Georgia Tech. Earlier, Khondker has worked as Analog IC Designer from
2005 to 2010 developing commercial power management ICs. He was a
graduate intern at Intel Labs in the summers of 2013 and 2014, where
he worked on adaptive voltage regulation for guardband reduction and
cross-coupled voltage regulators with dynamic load sharing for
microprocessors.

Host: Ryan Robucci, robucci at umbc.edu

  -- more information and directions: https://bit.ly/UMBCtalks --