GB1438005A - Superconducting memory cell - Google Patents
Superconducting memory cellInfo
- Publication number
- GB1438005A GB1438005A GB3757073A GB3757073A GB1438005A GB 1438005 A GB1438005 A GB 1438005A GB 3757073 A GB3757073 A GB 3757073A GB 3757073 A GB3757073 A GB 3757073A GB 1438005 A GB1438005 A GB 1438005A
- Authority
- GB
- United Kingdom
- Prior art keywords
- loop
- current
- josephson
- branch
- superconducting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/44—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using super-conductive elements, e.g. cryotron
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
Abstract
1438005 Superconductive devices INTERNATIONAL BUSINESS MACHINES CORP 8 Aug 1973 [29 Sept 1972] 37570/73 Heading H3X A superconductive storage cell for use in a storage matrix comprises two branches 11, 12, Fig. 1, forming a loop, with a Josephson device 13 in one branch and the loop inductance primarily concentrated in the other branch, the loop current being switched from one direction to the other, or alternatively changed in magnitude, by coincidence of currents I w , I c in a word line 14 connected to the loop and a digit line 16 coupled to the Josephson device. An essential requirement for loop current switching is that the condition is met, i mo being the maximum Josephson current at zero magnetic field, L the loop inductance and # o the magnetic flux quanta capable of being trapped in the loop. Construction of a cell is shown in Figs. 3A and 3B in which a common Pb ground plane 30 supports, with interleaved insulating SiO or SiO 2 films, a loop 11, 12 formed by a superconducting layer 32 and a digit line 16 formed by a superconducting Pb layer 35. The Josephson device in branch 11 consists of two overlapping superconducting layers 32a and 32b of InPb and Pb respectively, the layers being separated by a thin PbO film 33. Suitable dimensions are given. A matrix of such cells with the word and digit lines 55 1 -55 3 and 54 1 -54 3 serially connected in rows and columns is shown in Fig. 5, cell selection by coincident currents being effected in the normal manner from an address register 51 through decoders 52, 53 and current drivers X 1 -X 3 , Y 1 -Y 3 . Reading is effected either by an induced voltage in a sense line due to flux change when the loop current reverses or changes, or by using a further Josephson junction which is influenced by the loop magnetic field.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1430472A CH539919A (en) | 1972-09-29 | 1972-09-29 | Superconducting memory cell |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1438005A true GB1438005A (en) | 1976-06-03 |
Family
ID=4399694
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3757073A Expired GB1438005A (en) | 1972-09-29 | 1973-08-08 | Superconducting memory cell |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS537330B2 (en) |
CH (1) | CH539919A (en) |
DE (1) | DE2343441A1 (en) |
FR (1) | FR2201519B1 (en) |
GB (1) | GB1438005A (en) |
IT (1) | IT991354B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3983419A (en) * | 1974-12-31 | 1976-09-28 | International Business Machines - Ibm | Analog waveform transducing circuit |
US4130893A (en) * | 1977-03-29 | 1978-12-19 | International Business Machines Corporation | Josephson memory cells having improved NDRO sensing |
EP0440171A1 (en) | 1990-01-30 | 1991-08-07 | Canon Kabushiki Kaisha | Camera |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1137958A (en) * | 1966-10-12 | 1968-12-27 | Mullard Ltd | Improvements in or relating to superconductive devices and to circuits including such devices |
US3643237A (en) * | 1969-12-30 | 1972-02-15 | Ibm | Multiple-junction tunnel devices |
US3705393A (en) * | 1970-06-30 | 1972-12-05 | Ibm | Superconducting memory array using weak links |
-
1972
- 1972-09-29 CH CH1430472A patent/CH539919A/en not_active IP Right Cessation
-
1973
- 1973-07-24 IT IT2696773A patent/IT991354B/en active
- 1973-08-08 GB GB3757073A patent/GB1438005A/en not_active Expired
- 1973-08-21 JP JP9299173A patent/JPS537330B2/ja not_active Expired
- 1973-08-22 FR FR7330984A patent/FR2201519B1/fr not_active Expired
- 1973-08-29 DE DE19732343441 patent/DE2343441A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE2343441A1 (en) | 1974-04-11 |
JPS537330B2 (en) | 1978-03-16 |
CH539919A (en) | 1973-07-31 |
JPS4973041A (en) | 1974-07-15 |
IT991354B (en) | 1975-07-30 |
FR2201519B1 (en) | 1976-06-18 |
FR2201519A1 (en) | 1974-04-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |