Design of HTS RSFQ circuits

After more than a decade of research in single flux quantum (SFQ) circuits, a high level of understanding the requirements for designing them with high-T-c superconductors (HTS) has been gained. Recently, the fabrication processes are being developed to be more and more in accordance with practical requirements for the design of real digital circuits. The contribution describes the complex relationship of desired high operation temperature and required low bit-error probability on a quantitative level. Suitable guidelines for circuit dimensioning are given. The discussion is oriented at one of the contemporary technological approaches. It is concluded that, despite some previous estimations, FITS SFQ circuits can work stable theoretically also at a relatively high operation temperature. (C) 2003 Elsevier B.V. All rights reserved.