Design and implementation of a RSFQ superconductive digital electronics cell library

[摘要] ENGLISH ABSTRACT: Rapid Single Flux Quantum (RSFQ) cells are key in the design of complex and applicable RSFQelectronic circuits. These cells are low-level circuit elements that are used repeatedly to buildlarger, applicable RSFQ circuitry.Making these cells simple to layout and manufacture, but reliable for extensive use demands acareful development process for RSFQ cells. Cell functionality is verified through simulations,thereafter the cell is laid out in special software packages. Inductance of on-chip superconductorstructures is extracted through careful modelling with numerical field solver software.A cell library has been developed by incorporating existing or published cells after further analysisand optimization, as well as developing new cells. Cells that have been adapted into thelibrary include the Josephson transmission line (JTL), Splitter, Merger, D-Flip Flop (DFF),T-Flip Flop (TFF), NOT, AND, OR and XOR, DC-SFQ and SFQ-DC and PTL Driver andReceivers. New cells include NOR, NAND and XNOR. The cells were designed for the IPHT'sRSFQ1D 1kA/cmª and Hypres' 4.5kA/cmª processes.The cells in the library have good bias current operating margins obtained through simulations(> ±26%). All cells have all the parameters listed in the thesis including extracted inductancevalues.In order to have a complete and verified RSFQ cell library, cells have been sent for fabricationat IPHT and Hypres facilities. These cells can now be tested on-chip, in the laboratory, toestablish functionality and practical bias current margins. All test signal patterns and biascurrents required for testing are defined to allow co-workers or collaborators to test the cells.

[发布机构] Stellenbosch University