M.I. Khabipov , W. Kessel, F.-Im. Buchholz, R. Dolata, J. Niemeyer
{"title":"Bit error rate experiments in ring-shaped RSFQ circuits","authors":"M.I. Khabipov , W. Kessel, F.-Im. Buchholz, R. Dolata, J. Niemeyer","doi":"10.1016/S0964-1807(99)00034-4","DOIUrl":null,"url":null,"abstract":"<div><p>Ring-shaped rapid single flux quantum (RSFQ) circuits composed of segments of Josephson transmission lines (JTLs) and other RSFQ circuits enable permanent SFQ pulse circulation. New ring structures of different designs have been realized which comprise T-flipflop (TFF) and multiplier (MULT) circuits. Reliability in circuit operation has been proven experimentally by a bit error rate <em>BER</em>≅10<sup>−16</sup>. The fabrication process has been optimized by using PTB-4<!--> <em>μ</em>m Nb/Al<sub>2</sub>O<sub>3</sub>–Al/Nb trilayer technology with externally shunted tunnel junctions of critical current densities of <em>j</em><sub>c</sub>=≅1<!--> <!-->kA/cm<sup>2</sup>. Characteristic voltage is <em>V</em><sub>c</sub>=250<!--> <em>μ</em>V and Steward–McCumber parameter <em>β</em><sub>c</sub><span>≤1. A linear dependence of pulse circulation frequency on JTL bias currents has been measured within a bias current interval of 20%.</span></p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 10","pages":"Pages 719-725"},"PeriodicalIF":0.0000,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(99)00034-4","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Superconductivity","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0964180799000344","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
Abstract
Ring-shaped rapid single flux quantum (RSFQ) circuits composed of segments of Josephson transmission lines (JTLs) and other RSFQ circuits enable permanent SFQ pulse circulation. New ring structures of different designs have been realized which comprise T-flipflop (TFF) and multiplier (MULT) circuits. Reliability in circuit operation has been proven experimentally by a bit error rate BER≅10−16. The fabrication process has been optimized by using PTB-4 μm Nb/Al2O3–Al/Nb trilayer technology with externally shunted tunnel junctions of critical current densities of jc=≅1 kA/cm2. Characteristic voltage is Vc=250 μV and Steward–McCumber parameter βc≤1. A linear dependence of pulse circulation frequency on JTL bias currents has been measured within a bias current interval of 20%.
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