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The performance result of a niobium photoswitch, realized on the ground plane layer of the low-Tc FLUXONICS RSFQ process which was designed, simulated and integrated with a processing RSFQ circuit is presented.

Research is described involving a tool for optimizing high temperature superconductor (HTS) logic circuits with large noise immunity.

Research is described involving parasitic interactions between the interconnects in high-density packaged RSFQ logic circuits.

Research describing the measurement of electromagnetic coupling in Josephson junction devices is presented. In particular the finite difference time domain technique is investigated.

Research is presented concerning the use of the Fokker-Planck equation in the calculation of the switching probability and bit error rates in a single Josephson junction, a comparator and a SQUID. Thermal noise analysis is discussed.

A hardware description language-based nominal circuit behavior modeling approach is proposed for the multipurpose design of rapid single flux quantum logic circuits. The approach provides circuit behavior evaluation criteria which can be employed in the input for circuit simulation as well as a yield-driven optimization cycle behavioral reference. The approach permits mixed-mode simulation and offers benefits in analysis speed-up and error localization.

The simplicial approximation and centers-of-gravity design centering methods were compared. They were applied to several rapid single flux quantum circuits and analytical test functions to test their effectiveness. Circuit simulation was conducted using a SPICE-type program with analog behavior modeling and transient noise simulation capabilities. An interactive yield optimization framework for cryoelectronic circuits was developed using the yield optimization strategies.