Patent US3886382A successfully refreshed from Google Patents.
US3886382A
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Balanced superconductive transmission line using Josephson tunnelling devices
Assignee: International Business Machines Corp
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Filing: 1973-12-27
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Granted: 1975-05-27
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Expires: 1993-12-27
Abstract
Abstract Superconductive circuitry is provided which consists of a transmission line having a terminal at each end thereof across which the output is measured, and which includes a plurality of pairs of Josephson tunnelling devices where each Josephson tunnelling device of a pair is located in the transmission line equally distant from opposite end terminals thereof so that the transmission line is balanced. Each of the Josephson tunnelling devices has a zero voltage and a finite voltage state. Control means are provided for simultaneously controlling the voltage switching point of each Josephson device of each pair of said Josephson devices. The transmission line is pulsed with a current so that each Josephson tunnelling device of each pair of devices which are biased by the control means will switch into the finite voltage state causing reflections in the transmission line in a balanced manner so that the transmission line stabilizing time is minimized.
Inventors
- 👤 Robert G Cain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:58
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/10; H10N60/12; G; G11; G11C; G11C11/00; G11C11/21; G11C11/44; H01; H01P; H01P3/00; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/856; Y10S505/857; Y10S505/86; Y10S505/861
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
In a transmission line having a terminal at each end thereof across which the output is measured; a plurality of pairs of Josephson tunnelling devices, each Josephson tunnelling device of a pair being located in the transmission line equally distant from opposite end terminals thereof to provide a balanced transmission line, each Josephson tunnelling device having a zero voltage and a finite voltage state; control means for simultaneously controlling the voltage switching point of each Josephson device of each pair of said Josephson tunnelling devices; current means for providing electrical current through said transmission line and each of said Josephson tunnelling devices of each pair of devices causing any pair of Josephson tunnelling devices biased by said control means to simultaneously switch into its finite voltage state, thereby causing reflections in the transmission line in a balanced manner so that the transmission line stabilizing time is minimized.
Claim 2
Dependent Claim
147 words
In a transmission line having a terminal at each end thereof across which the output is measured; a plurality of pairs of Josephson tunnelling devices, each Josephson tunnelling device of a pair being located in the transmission line equally distant from opposite end terminals thereof to provide a balanced transmission line, each Josephson tunnelling device having a zero voltage and a finite voltage state; control means for simultaneously controlling the voltage switching point of each Josephson device of each pair of said Josephson tunnelling devices; current means for providing electrical current through said transmission line and each of said Josephson tunnelling devices of each pair of devices causing any pair of Josephson tunnelling devices biased by said control means to simultaneously switch into its finite voltage state, thereby causing reflections in the transmission line in a balanced manner so that the transmission line stabilizing time is minimized.
Claim 3
Dependent Claim
44 words
In a transmission line according to claim 1, wherein said transmission line is a strip line insulated from a ground plane and which has a termination impedance equal to the characteristic impedance of the transmission line across which the transmission line output is measured.
Claim 4
Dependent Claim
50 words
In a transmission line according to claim 1, wherein said control means includes at least one current carrying line located adjacent each Josephson device of each pair of Josephson devices, current through said current carrying line producing a magnetic field which intercepts each of said Josephson devices of each pair.
Claim 5
Dependent Claim
21 words
In a transmission line according to claim 1, wherein each of said Josephson tunnelling devices of each pair are planar devices.
Claim 6
Dependent Claim
143 words
In a logic array; a transmission line; a plurality of pairs of Josephson devices, each Josephson device of each pair being connected into said transmission line equidistant from opposite output terminals of said transmission line; a first and second control means located adjacent each of said Josephson devices of each pair of devices for controlling the critical current point of said Josephson devices, at which switching to the finite voltage state takes place; current means for providing electrical current through said transmission line of each of said Josephson tunnelling devices of each pair of devices causing any pair of Josephson tunnelling devices biased simultaneously by said first aNd second control means into the finite voltage state to switch into said finite voltage state, thereby causing reflections in the transmission line in a balanced manner so that the transmission line stabilizing time is minimized.
Claim 7
Dependent Claim
143 words
In a logic array; a transmission line; a plurality of pairs of Josephson devices, each Josephson device of each pair being connected into said transmission line equidistant from opposite output terminals of said transmission line; a first and second control means located adjacent each of said Josephson devices of each pair of devices for controlling the critical current point of said Josephson devices, at which switching to the finite voltage state takes place; current means for providing electrical current through said transmission line of each of said Josephson tunnelling devices of each pair of devices causing any pair of Josephson tunnelling devices biased simultaneously by said first aNd second control means into the finite voltage state to switch into said finite voltage state, thereby causing reflections in the transmission line in a balanced manner so that the transmission line stabilizing time is minimized.
Claim 8
Dependent Claim
32 words
In a logic array according to claim 5, wherein said transmission line is a strip line insulated from a ground plane and which serves as the read line for said logic array.
Claim 9
Dependent Claim
41 words
In a logic array according to claim 5, wherein said first control means includes data input lines forming the rows of said logic array for providing current therein which generates a magnetic field intercepting the pairs of Josephson devices adjacent thereto.
Claim 10
Dependent Claim
41 words
In a logic array according to claim 7, wherein said second control means includes a memory cell for providing current in accordance with the content of said cell which generates a magnetic field intercepting the pairs of Josephson devices adjacent thereto.
Claim 11
Dependent Claim
41 words
In a logic array according to claim 8, wherein said pairs of Josephson devices are switched into the finite voltage state when the first and second control means produce the current biasing and said current means provides the electrical current simultaneously.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |