Superconducting COSL building blocks for ultra-high speed logic circuits

[摘要] ENGLISH ABSTRACT: Complementary Output Switching Logic, or COSL, is used to define building blocks for ultrahighspeed (- 20 GHz) logic circuits. The family consists of the standard logic functionsORINOR, ANDINAND and XOR. A review of the principles of the Josephson junction, onejunctionand two-junction SQUID and the operation of COSL is given as an introduction. Thenew building blocks include a new single gate inverter, alternatives to the existing NOR andNAND gates and a number of latching functions. Yield analysis and optimisation by a MonteCarlo method is discussed. Additionally, the physical layout of these circuits is considered.Changes in the layout of COSL gates to improve the uniformity of current distribution in thegates are briefly mentioned.

[发布机构] Stellenbosch University