RSFQ Circuitry Using Intrinsic π-Phase Shifts

Ortlepp, T. and Mielke, A.O. and Verwijs, C.J.M. and Foo, K.F.K. and Andreski, A. and Rogalla, H. and Uhlmann, F.H. and Hilgenkamp, H. (2007) RSFQ Circuitry Using Intrinsic π-Phase Shifts. IEEE Transactions on Applied Superconductivity, 17 (2). pp. 659-663. ISSN 1051-8223

Preview

PDF
1230Kb

Abstract:	The latching of temporary data is essential in the rapid single flux quantum (RSFQ) electronics family. Its pulse-driven nature requires two or more stable states in almost all cells. Storage loops must be designed to have exactly two stable states for binary data representation. In conventional RSFQ such loops are constructed to have two stable states, e.g. by using asymmetric bias currents. This bistability naturally occurs when phase-shifting elements are included in the circuitry, such as pi-Josephson junctions or a pi-phase shift associated with an unconventional (d-wave) order parameter symmetry. Both approaches can be treated completely analogously, giving the same results. We have demonstrated for the first time the correct operation of a logic circuit, a toggle-flip-flop, using rings with an intrinsic pi-phase shift (pi-rings) based on hybrid high-Tc to low-Tc Josephson junctions. Because of their natural bistability these pi-rings improve the device symmetry, enhance operation margins and alleviate the need for bias current lines.
Item Type:	Article
Copyright:	© IEEE
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/75090
Official URL:	http://dx.doi.org/10.1109/TASC.2007.898635
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page

Metis ID: 242729