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Focuses on the design of a double junction ring oscillator based on shunted, stacked junctions. Current-voltage characteristics; Synchronous switching of nodal junctions; Transmission line modeling and results.

Focuses on the performance of a three dimensional integrated rapid single-flux-quantum T-flip-flop logic circuit using stacktrons. Stacktron structure; Current-voltage characteristics.

Investigates a balanced current comparator, which contains a basic component of all Rapid Single Flux Quantum (RSFQ) circuits. Use of high-Tc Josephson junctions for digital applications; Dependence of the dc-voltage across the Josephson junctions on signal current.

The use of high-T/sub c/ Josephson junctions for digital applications requires a careful study of the influence of thermal noise on circuit performance. We investigated a balanced current comparator, which contains a basic component of all RSFQ circuits: two overdamped Josephson junctions connected in series. The dependence of the dc-voltage across the Josephson junctions on signal current was measured to determine the threshold uncertainty of switching of the comparator. The experimental data obtained at different sampling pulse frequencies, in a temperature range from 10 to 50 K, were compared with a theoretical model, taking into account the influence of thermal noise as well as of sampling pulse frequency. [ABSTRACT FROM PUBLISHER]