Relaxation oscillator architectures with delay and offset-voltage compensation

doctoral thesis

• Title (croatian): Arhitekture relaksacijskoga oscilatora s kompenzacijom kašnjenja i napona pomaka
• Author: Josip Mikulić; MBZ: 41165
• Mentor: Adrijan Barić (mentor)
• Committee member: Marko Koričić (predsjednik povjerenstva)
• Committee member: Vladimir Čeperić (član povjerenstva)
• Committee member: Jurica Kundrata (član povjerenstva)
• Committee member: Georges Gielen https://orcid.org/0000-0002-4061-9428 (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2023-06-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

This thesis presents the detailed theoretical analysis, measurements, and performance comparison of several novel relaxation oscillator architectures, having the main focus on the compensation of the propagation delay and offset voltage of the comparator stage. The first architecture introduces two replica comparators that imitate the behavior of the sensing comparators and compensate for their influence on the timing. Next, a further enhancement of the relaxation oscillator core architecture is proposed, comprising a self–compensating chopped comparator pair that entirely cancels the propagation delay and offset voltage of the comparators while being more efficient in power consumption and area. The third architecture introduces additional integrating unit that is used for measurement and compensation of the propagation delay, being compatible with low supply environments and advanced technology nodes. Furthermore, the fourth relaxation oscillator core architecture comprises replica chopped comparator, providing an efficient delay and offset cancellation with minimal influence on power, area, and signal integrity. Eventually, a cost–efficient methodology for a post–manufacturing temperature calibration that significantly reduces the temperature drift of the output frequency is proposed and demonstrated on a manufactured self–sustaining oscillator prototype.

Abstract (croatian)

Ovaj rad predstavlja detaljnu analizu, mjerenja i usporedbu performansi nekoliko predloženih arhitektura relaksacijskih oscilatora koje su značajno unaprijeđene kompenzacijom kašnjenja i napona pomaka komparatora. Prva predložena arhitektura oscilatora uvodi dva replicirajuća komparatora pomoću kojih se mjeri i kompenzira utjecaj očitavajućih komparatora na stabilnost frekvencije. Nadalje, u drugoj arhitekturi, mjerenje utjecaja komparatora je izvedeno pomoću samokompenzirajućeg preklopnog para komparatora, čime je postignuto dodatno poboljšanje stabilnosti takta uz manju potrošnju struje i površinu na siliciju. Treća predložena arhitektura zasniva se na replicirajućem integratoru te je prikladna za niske napone napajanja i napredne tehnološke procese. Dodatno, četvrta predložena arhitektura jezgre oscilatora temeljena na replicirajućem preklopnom komparatoru donosi dobre performanse uz jednostavnost implementacije i minimalan utjecaj na potrošnju struje i površinu na čipu. Najzad, predložena je metoda temperaturne kalibracije relaksacijskih oscilatora koja se zasniva na mjerenju frekvencije na samo dvije proizvoljne temperature, čime se ograničava porast troškova proizvodnje.

• Keywords: relaxation oscillator; offset voltage; delay cancellation; temperature calibration; process calibration; on–chip design
• Keywords (croatian): relaksacijski oscilator; napon pomaka; kašnjenje; temperaturna kalibracija; kalibracija procesnih parametara; potpuno integrirani sklopovi
• Language: english
• URN:NBN: urn:nbn:hr:168:114925
• Promotion: 2024
• Study programme: Title: Doctoral study programme "Electrical Engineering and Computing"; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, po-dručje tehničkih znanosti (doktor/doktorica znanosti, po-dručje tehničkih znanosti)
• Type of resource: Text
• Extent: 181 str. : graf. prikazi ; 31 cm.
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-02-13 14:48:28