| MS TSA Meeting

Name of the Speaker: Mr. Bellamkonda Ajay Kumar (EE19S054)
Guide: Dr. Saurabh Saxena
Online meeting link: https://meet.google.com/cow-mwzy-qnu
Date/Time: 4th May 2024 (Saturday), 3:30 PM
Title: System and Circuit-Level Techniques for Detecting Intentional Electromagnetic Interference

Abstract

Intentional Electromagnetic Interference (IEMI) spanning the 0.5–2.0GHz range threatens electronic systems and wireless communication by emitting significant power within this frequency spectrum. This work investigates the characteristics of IEMI at the receiver end under office environment conditions using off-the-shelf components. Existing 3-10GHz UWB channel model parameters are adapted for 0.5-2GHz IEMI transmission and verified experimentally.

Leveraging the experimental observations, we effectively detect ultra wideband (UWB) IEMI using multiband spectrum sensing techniques. We devise a system-level IEMI receiver to facilitate this detection. The frequency band is segmented into eight sub-bands, and a software-defined radio ADRV9009 is employed to downconvert and digitize each sub-band. A comparative study of receiving and combining the eight sub-bands simultaneously and in a time-interleaved manner is presented.

The challenge of receiving a high power wide bandwidth signal is addressed by designing a highly linear receiver front-end IC in TSMC 65nm CMOS to process the wideband simultaneously. First, a single-ended 1-28dB tunable attenuator matched to antenna 50-Ohms impedance drives an active balun with minimal gain and phase mismatch across the wide bandwidth (BW). Second, the output of balun is filtered and downconverted separately in eight sub-bands with 200MHz bandwidth. Harmonic mixing and crosstalk are minimized during the simultaneous processing of eight sub-bands. The fabricated prototype operates on a 1.2V supply, consuming 264mW power to output the down-converted sub-bands from the specified frequency range. Subsequently, these down-converted sub-bands are digitized and processed off-chip to retrieve the IEMI signal accurately.