IEICE Transactions on Electronics · 2010 · 18 citations · 9 references
EngineeringComputer EngineeringElectrical EngineeringMicroelectronicsSemiconductor DevicesVlsi DesignCmos Circuit DesignIntegrated Circuit DesignMicrostrip CircuitsQuantum CircuitsRoutingTransmission LinesFabrication ProcessesJosephson JunctionsMicrostrip LinesMicrostrip Transmission LinesQuantum Circuit Design AutomationQuantum Circuit RoutingSwitch ArchitectureTransmission Line Routing
We demonstrated an automated passive-transmission-line routing tool for single-flux-quantum (SFQ) circuits. The tool is based on the A* algorithm, which is widely used in CMOS LSI design, and tuned for microstrip/strip lines formed in the SRL 4-Nb layer structure. In large-scale SFQ circuits with 10000-20000 Josephson junctions, such as microprocessors, 80-90% of the wires can be automatically routed in about ten minutes. We verified correct operation above 40GHz for an automatically routed 4 × 4 switch circuit from on-chip high-speed tests. The resulting circuit size and operating frequency were comparable to those of a manually designed result. We believe that the tool is useful for large-scale SFQ circuit design using conventional fabrication processes.
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A single flux quantum standard logic cell library
Shinichi Yorozu, Yusuke Kameda, Hirotaka Terai et al. · Physica C Superconductivity · 2002 · 312 citations