1 research outputs found
Low Power Circuit Design in Sustainable Self Powered Systems for IoT Applications
The Internet-of-Things (IoT) network is being vigorously pushed forward from many fronts in
diverse research communities. Many problems are still there to be solved, and challenges are found
among its many levels of abstraction. In this thesis we give an overview of recent developments
in circuit design for ultra-low power transceivers and energy harvesting management units for the
IoT.
The first part of the dissertation conducts a study of energy harvesting interfaces and optimizing
power extraction, followed by power management for energy storage and supply regulation. we
give an overview of the recent developments in circuit design for ultra-low power management
units, focusing mainly in the architectures and techniques required for energy harvesting from
multiple heterogeneous sources. Three projects are presented in this area to reach a solution that
provides reliable continuous operation for IoT sensor nodes in the presence of one or more natural
energy sources to harvest from.
The second part focuses on wireless transmission, To reduce the power consumption and boost
the Tx energy efficiency, a novel delay cell exploiting current reuse is used in a ring-oscillator
employed as the local oscillator generator scheme. In combination with an edge-combiner power
amplifier, the Tx showed a measured energy efficiency of 0.2 nJ=bit and a normalized energy
efficiency of 3.1 nJ=bit:mW when operating at output power levels up to -10 dBm and data rates
of 3 Mbps