GB1502690A - Josephson junction storage cells - Google Patents
Josephson junction storage cellsInfo
- Publication number
- GB1502690A GB1502690A GB10081/76A GB1008176A GB1502690A GB 1502690 A GB1502690 A GB 1502690A GB 10081/76 A GB10081/76 A GB 10081/76A GB 1008176 A GB1008176 A GB 1008176A GB 1502690 A GB1502690 A GB 1502690A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mode
- cell
- quantum
- currents
- josephson junction
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/10—Junction-based devices
- H10N60/12—Josephson-effect devices
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
Abstract
1502690 Superconductive devices INTERNATIONAL BUSINESS MACHINES CORP 12 March 1976 [13 March 1975] 10081/76 Heading H3X In a data storage cell comprising at least one Josephson junction in which binary data is selectively represented by 0 and 1 flux quanta modes, the cell is arranged to exhibit an undercritically damped switching characteristic so that non-destructive read out of stored information is obtained by the ability to switch from an 0 quantum mode to a 2 quantum mode, followed by reversion to the 0 quantum mode, and the inability of a switching operation to affect a 1 quantum mode. Storage cells using vortex modes in long Josephson junctions. An interferometer type storage cell is shown in Fig. 2 which comprises a lower electrode metallization M2 deposited on a substrate, a thin oxide layer in the shaded area, and upper electrode metallization M3. In a two co-ordinate storage arrangement, Fig. 5 (not shown), writing is effected during the period when a control current I B aux is applied to an auxiliary line coupled to the junctions to decrease the maximum Josephson current. To switch a storage cell from an 0 to a 1 mode, a bit current is also applied to a control line coupled to inductive region of the cell, followed by an overlapping write current I w . For non-destructive readout producing a mode change only when an 0 mode is present, the overlapping sequence of bit and word currents I b and I w alone are used, the sequentially applied currents being of such magnitude as to circumvent a point x, Fig. 3, defining the minimum boundary of the 0 mode and falling within the shaded area of the mode characteristic shown. A switch to the 2 mode then occurs and this vortex mode is sustained until the currents are terminated. Reversion to the 0 mode then occurs. An alternative form of cell using vortex modes is described, Fig. 6 (not shown). Storage cells comprising a single Josephson junction shunted by an inductance. A suitable cell is shown in Fig. 10 which comprises metallized deposits M2, M3 with an intervening oxide layer forming a Josephson junction 38, the deposits also being connected at 40 to provide an inductive loop L. Lines for currents I B and I B aux are coupled to the inductive loop and the junction, respectively. No flux quantum is trapped within the inductance for an 0 state of the storage cell, while a trapped flux quantum is present for a 1 state. Writing and reading non-destructively is effected by the same programme of I B , I w and I B aux currents as previously described, the underdamped characteristic of the cell enabling a transition to an unstable 2 state for non-destructive readout. Sense circuits, Figs. 7, 8 and 9 (not shown). These are as described in Specification 1,450,343.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH317875A CH591740A5 (en) | 1975-03-13 | 1975-03-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1502690A true GB1502690A (en) | 1978-03-01 |
Family
ID=4250305
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10081/76A Expired GB1502690A (en) | 1975-03-13 | 1976-03-12 | Josephson junction storage cells |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS5830677B2 (en) |
BE (1) | BE837996A (en) |
CH (1) | CH591740A5 (en) |
FR (1) | FR2304145A1 (en) |
GB (1) | GB1502690A (en) |
IL (1) | IL49008A (en) |
IT (1) | IT1054579B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4117503A (en) * | 1977-06-30 | 1978-09-26 | International Business Machines Corporation | Josephson interferometer structure which suppresses resonances |
-
1975
- 1975-03-13 CH CH317875A patent/CH591740A5/xx not_active IP Right Cessation
-
1976
- 1976-01-27 FR FR7602498A patent/FR2304145A1/en active Granted
- 1976-01-28 BE BE163871A patent/BE837996A/en unknown
- 1976-01-30 IT IT19736/76A patent/IT1054579B/en active
- 1976-02-10 IL IL49008A patent/IL49008A/en unknown
- 1976-03-12 JP JP51026262A patent/JPS5830677B2/en not_active Expired
- 1976-03-12 GB GB10081/76A patent/GB1502690A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5830677B2 (en) | 1983-06-30 |
JPS51113544A (en) | 1976-10-06 |
FR2304145B1 (en) | 1980-05-30 |
BE837996A (en) | 1976-05-14 |
DE2555784A1 (en) | 1976-09-16 |
IL49008A0 (en) | 1976-04-30 |
DE2555784B2 (en) | 1977-05-12 |
CH591740A5 (en) | 1977-09-30 |
IT1054579B (en) | 1981-11-30 |
IL49008A (en) | 1977-12-30 |
FR2304145A1 (en) | 1976-10-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |