Accession Number:

ADA280871

Title:

An Approach for Dense Superconducting Memories with Column Sense

Descriptive Note:

Final rept.

Corporate Author:

HYPRES INC ELMSFORD NY

Personal Author(s):

• Bradley, Paul
• Yuh, Perng-Fei

Report Date:

1994-01-01

Pagination or Media Count:

11.0

Abstract:

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

Descriptors:

• *MEMORY DEVICES
• *READ OUT TECHNIQUES
• *SUPERCONDUCTIVITY
• *INDUCTORS
• DIGITAL SYSTEMS
• ELECTRONICS
• CELLS
• INTERFERENCE
• STORAGE
• JOSEPHSON JUNCTIONS
• ELECTRICAL EQUIPMENT
• SWITCHES
• CURRENTS
• CIRCULATION
• LOOPS
• CIRCUITS
• QUANTUM THEORY
• SEMICONDUCTORS
• RANDOM ACCESS COMPUTER STORAGE

Subject Categories:

• Electrical and Electronic Equipment
• Computer Hardware
• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE