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An Approach for Dense Superconducting Memories with Column Sense
HYPRES INC ELMSFORD NY
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More than any other obstacle, the lack of a fast, dense random access memory RAM has hindered the development of Josephson digital electronics. The principal limitation has been the physical size of the superconductive memory cell which is almost always a loop of superconductor which stores a persistent circulating current as the data. This inductor together with the necessary switches and readout circuitry have typically been between one and two orders of magnitude larger than a semiconductor RAM using the same linewidths. This much lower density has meant that superconductive memories of a given capacity are much larger than the semiconductors alternative this extra distance and time- of-flight for a memory access cancels the order of magnitude speed advantage the superconductive circuits enjoy. Hypres has proposed, designed, and successfully tested a much smaller memory cell than any other in superconductive electronics
APPROVED FOR PUBLIC RELEASE