  The Single Flux Quantum (SFQ) logic family is a novel digital logic as it
provides ultra-fast and energy-efficient circuits. For large-scale SFQ circuit
design, specialized electronic design automation (EDA) tools are required due
to the differences in logic type, timing constraints and circuit architecture,
in contrast to the CMOS logic. In order to improve the overall performance of
an SFQ circuit, an efficient routing algorithm should be applied during the
layout design to perform accurate timing adjustment for fixing hold violations
and optimizing critical paths. Thus, a hybrid Josephson transmission line and
passive transmission line routing framework is proposed. It consists of four
main modules and an exploration of the potential timing performance based on
the given layout placement. The proposed routing tool is demonstrated on seven
testbench circuits. The obtained results demonstrate that the operating
frequency is greatly improved, and all the hold violations are eliminated for
each circuit.

Emerging Technologies;Hardware Architecture