Interference-robust CMOS receivers for IoT: Highly linear RF front-ends at low power

Vijaya Kumar Purushothaman

Research output: ThesisPhD Thesis - Research UT, graduation UT

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Abstract

Wireless technologies have brought Internet access to more than half of the world’s population in the last decade. Nowadays, Internet-of-Things (IoT) technology extends the internet connectivity to sensor nodes embedded in machines, animals, and plants. It will soon put us in a realm of billions of interconnected sensor nodes networking and communicating with each other. Such unprecedented growth of wireless devices puts a big challenge of sustainable and robust connectivity in front of us. Concretely, this challenge demands a wireless sensor node with low power and robust connectivity. Radios are the physical interface for sensor nodes with the external world and are one of the power-hungry components in sensor nodes. Hence it is imperative to make them energy-efficient and interference-robust.

This thesis explores CMOS passive mixer-first receiver topology to enhance the interference tolerance of receivers in IoT radios. The dissertation proposes a novel N-path filter/mixer topology at the circuit level and a multipath cross-correlation technique at the system level. Two test-chips of mixer-first receiver front ends, using these techniques, are implemented in CMOS FDSOI 22nm technology as a proof-of-concept. The experimental prototypes demonstrate voltage gain in passive mixers and exhibit high-Q widely-tunable RF filtering, large out-of-band and harmonic interferer tolerance, and moderate noise figure while consuming much lower power than several state-of-the-art receivers.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Nauta, Bram, Supervisor
  • Klumperink, Eric A.M., Supervisor
Award date2 Feb 2024
Place of PublicationEnschede
Publisher
Print ISBNs978-90-365-5961-4
Electronic ISBNs978-90-365-5962-1
DOIs
Publication statusPublished - 2 Feb 2024

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