We study the dependence between the JTL inductance and its SFQ pulse propagation speed. An optimal value, being far away from the generally established design rules, is found. The dependence of this optimal value on the JTL parasitics is also considered. The bias margins behaviour around the new optimum is presented.

An important precondition for the successful realization of any high-speed complex electronic device are the efficient (in terms of speed and signal degradation) long-distance interconnects. The two techniques for long-distance on-chip signal propagation, used by the modern Rapid Single Flux Quantum (RSFQ) designefi -via Josephson Transmission Lines (JTLs) and via Passive Transmission Lines (FTLs) -are investigated here. Novel design techniques are presented, which significantly improve the JTLs and FTLs performance as long-distance SFQ pulse transmitters within the digital RSFQ circuits.