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Methods that improve high frequency Single Flux Quantum electronics design
Thesis (PhD)--Stellenbosch University, 2021.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2021
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| _version_ | 1867614093327728640 |
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| access_status_str | Open Access |
| author | Le Roux, Paul |
| author2 | Fourie, Coenrad |
| author_browse | Fourie, Coenrad Le Roux, Paul |
| author_facet | Fourie, Coenrad Le Roux, Paul |
| author_sort | Le Roux, Paul |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (PhD)--Stellenbosch University, 2021. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/109806 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:46:33.531Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/109806 Methods that improve high frequency Single Flux Quantum electronics design Le Roux, Paul Fourie, Coenrad Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. Single flux UCTD Quantum electronics High-frequency induction heating Electric circuits Thesis (PhD)--Stellenbosch University, 2021. ENGLISH ABSTRACT: In this thesis, we cover various methods that improve high-frequency Single Flux Quantum electronics design. Accurately modelling high-frequency effects is vital in high-frequency Single Flux Quantum electronics design. The passive transmission line is, currently, the most inaccurately modelled circuit component. We, therefore, developed a new 2D quasiTransverse-Magnetic method to calculate transmission line properties of superconductor structures. The new method can take into account quasi-particle losses as well as dielectric losses. The frequency response of a passive transmission line with arbitrary length can then readily be obtained from the transmission line properties. The high-frequency response is informative, but a time-domain simulation model is necessary to determine the effect on high-frequency circuit dynamics. Accordingly, we developed the Superconductor Vector Fitting algorithm so that we can take arbitrary superconductor frequency responses and convert them into time-domain simulation models. Complex dynamical behaviour, made more complicated by the new numerical simulation models, currently prohibits designing circuits by only using design equations. Automatic optimization routines are used to adjust circuit parameters to improve fabrication yield. Existing routines suffer from issues ranging from suboptimal circuits to severe performance issues. We developed a new and novel yield optimization algorithm, Distance-To-Failure-Maximization, that can be used to optimize superconductor circuits that are verified u sing time-domain simulations. High-frequency circuits can be sensitive to changes in bias current from parasitics mutual inductances. We developed the fundamental inductance model to model all inductive effects accurately. The fundamental inductance model can also be used to construct design equations which accounts for parasitic effects as well as reduce the number of unknowns in the yield optimization procedure. We use all the above methods in a detailed case study on the design of a JTLT. We take into account attenuation, impedance mismatch, flux mismatch, and resonance during the design of the JTLT circuit. With this, we conclude that the methods we developed have brought significant improvements to high-frequency Single Flux Quantum design. AFRIKAANSE OPSOMMING: In hierdie tesis behandel ons verskillende metodes wat hoëfrekwensie ontwerp van Single Flux Quantum elektronika verbeter. Akkurate modellering van hoëfrekwensie-effekte is uiters belangrik in ’n hoëfrekwensie Single Flux Quantum elektronika ontwerp. Die passiewe transmissielyn is tans die mees onakkuraatste gemodelleerde komponent. Daarom het ons ’n nuwe 2D kwasi-transvers-magnetiese metode ontwikkel om transmissielynseienskappe van supergeleierstrukture te bereken. Die nuwe metode kan kwasi-partikel-verliese sowel as diëlektriese verliese in ag neem. Die frekwensierespons van ’n passiewe transmissielyn met arbitrêre lengte kan dan maklik verkry word vanaf die transmissielynseienskappe. Die hoëfrekwensie-respons is insiggewend, maar ’n tyd-domein-simulasiemodel is nodig om die effek op die hoëfrekwensie stroombaan dinamika te bepaal. Gevolglik het ons die Superconductor Vector Fitting-algoritme ontwikkel sodat ons arbitrêre frekwensie-response van supergeleiers kan neem en dit omskep in tyd-domeinsimulasiemodelle. Komplekse dinamiese gedrag, wat meer ingewikkeld gemaak word deur die nuwe numeriese simulasiemodelle, verbied tans die ontwerp van stroombane deur slegs ontwerp-vergelykings te gebruik. Outomatiese optimeringsroetines word gebruik om stroombaanparameters aan te pas om die vervaardigingsopbrengs te verbeter. Bestaande roetines ly van probleme wat wissel van suboptimale stroombane tot ernstige berekeningstyd probleme. Ons het ’n nuwe opbrengstoptimaliseringsalgoritme ontwikkel, Distance-to-Failure-Maximization, wat gebruik kan word om supergeleierstroombane te optimaliseer wat met behulp van tyddomein-simulasies geverifieer word. Hoëfrekwensie-stroombane kan sensitief wees vir veranderinge in aanwendstroom wat veroorsaak word deur parasities magnetiese induktansies. Ons het die fundamentele induktansie-model ontwikkel om alle induktiewe effekte akkuraat te modelleer. Die fundamentele induktansiemodel kan ook gebruik word om ontwerpvergelykings te konstrueer wat parasitiese effekte in ag neem, sowel as om die aantal onbekendes in die opbrengsoptimaliseringsprosedure te verminder. Ons gebruik al die bogenoemde metodes in ’n gedetailleerde gevallestudie oor die ontwerp van ’n JTLT. Ons neem die attenuasie, die impedansie-wanaanpassing, die magnetiesevloed-wanaanpassing en die resonansie in ag tydens die ontwerp van die JTLT-stroombaan. Hiermee kom ons tot die gevolgtrekking dat die metodes wat ons ontwikkel het, ’n beduidende verbetering in die hoëfrekwensie-Single Flux Quantum-ontwerp gebring het. Doctoral 2021-01-27T09:17:43Z 2021-04-21T14:26:57Z 2021-01-27T09:17:43Z 2021-04-21T14:26:57Z 2021-03 Thesis http://hdl.handle.net/10019.1/109806 en_ZA Stellenbosch University 153 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Single flux UCTD Quantum electronics High-frequency induction heating Electric circuits Le Roux, Paul Methods that improve high frequency Single Flux Quantum electronics design |
| title | Methods that improve high frequency Single Flux Quantum electronics design |
| title_full | Methods that improve high frequency Single Flux Quantum electronics design |
| title_fullStr | Methods that improve high frequency Single Flux Quantum electronics design |
| title_full_unstemmed | Methods that improve high frequency Single Flux Quantum electronics design |
| title_short | Methods that improve high frequency Single Flux Quantum electronics design |
| title_sort | methods that improve high frequency single flux quantum electronics design |
| topic | Single flux UCTD Quantum electronics High-frequency induction heating Electric circuits |
| url | http://hdl.handle.net/10019.1/109806 |
| work_keys_str_mv | AT lerouxpaul methodsthatimprovehighfrequencysinglefluxquantumelectronicsdesign |