Patent US3758795A successfully refreshed from Google Patents.
US3758795A
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Superconductive circuitry using josephson tunneling devices
Assignee: International Business Machines Corp
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Filing: 1972-06-30
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Granted: 1973-09-11
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Expires: 1992-06-30
Abstract
Abstract Superconductive circuitry using a first Josephson tunneling device connected to a transmission line having a termination such that no reflections result when the Josephson tunneling diode switches between two stable voltage states, in accordance with applied input signals. Means are provided for producing the input signals to switch the first Josephson tunneling device and further Josephson tunneling devices are provided whose voltage state depends on the current pulse delivered to the transmission line when the first Josephson tunneling device switches from a first voltage state to a second voltage state. Logic circuitry is shown using this structure, as well as fan-in and fan-out Josephson tunneling device circuits.
Inventors
- 👤 W Anacker
- 👤 J Matisoo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:51
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/195; H03K19/1952; H03K3/00; H03K3/02; H03K3/38; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/856; Y10S505/857; Y10S505/865
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A first Josephson tunneling device, said device having two stable voltage states, current means for providing electrical current through said first Josephson tunneling device, control means for controlling the voltage state of said first Josephson tunneling device, a transmission line connected to said first Josephson tunneling device, said transmission line receiving electrical pulses therein when said first Josephson tunneling device is switched between said voltage states, said transmission line being terminated in an impedance which substantially prevents reflections in said transmission line, a second Josephson tunneling device located adjacent said transmission line, the electrical pulses in said transmission line producing a magnetic field which intercepts said second Josephson tunneling device.
Claim 2
Dependent Claim
110 words
A first Josephson tunneling device, said device having two stable voltage states, current means for providing electrical current through said first Josephson tunneling device, control means for controlling the voltage state of said first Josephson tunneling device, a transmission line connected to said first Josephson tunneling device, said transmission line receiving electrical pulses therein when said first Josephson tunneling device is switched between said voltage states, said transmission line being terminated in an impedance which substantially prevents reflections in said transmission line, a second Josephson tunneling device located adjacent said transmission line, the electrical pulses in said transmission line producing a magnetic field which intercepts said second Josephson tunneling device.
Claim 3
Dependent Claim
38 words
The apparatus of claim 1, where said control means includes at least one current carrying line located adjacent said first Josephson tunneling device, current through said line producing a magnetic field which intercepts said first Josephson tunneling Device.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1, where said first and second Josephson tunneling devices are planar devices.
Claim 5
Dependent Claim
38 words
The apparatus of claim 1, where said transmission line is comprised of first and second strip lines insulated from a ground plane, and said termination impedance is approximately twice the characteristic impedance of each of said strip lines.
Claim 6
Dependent Claim
32 words
The apparatus of claim 1, including additional Josephson tunneling devices located adjacent said transmission line, electrical pulses in said transmission line producing a magnetic field which intercepts said additional Josephson tunneling devices.
Claim 7
Dependent Claim
20 words
The apparatus of claim 1, where said termination impedance is comprised of a nonsuperconductive material connected to said transmission line.
Claim 8
Dependent Claim
33 words
The apparatus of claim 1, where said termination impedance includes an open-ended termination of proper characteristic impedance and sufficient length for suppression of electrical pulses which are generated anywhere along said transmission line.
Claim 9
Dependent Claim
24 words
The apparatus of claim 1, where said transmission line is terminated in an impedance approximately equal to the characteristic impedance of the transmission line.
Claim 10
Independent Claim
99 words
An apparatus using Josephson tunneling devices, comprising: a first Josephson tunneling device having first and second electrodes and a tunnel barrier therebetween across which Josephson current can tunnel, current means for producing electrical current through said first Josephson tunneling device, an electrical energy conductor connected to said first and second electrodes of said first Josephson tunneling device and terminated in an impedance which substantially eliminates reflections of electrical pulses in said conductor, a second Josephson tunneling device located adjacent said electrical energy conductor, electrical pulses in said conductor producing magnetic fields which couple to said second Josephson tunneling device.
Claim 11
Independent Claim
99 words
An apparatus using Josephson tunneling devices, comprising: a first Josephson tunneling device having first and second electrodes and a tunnel barrier therebetween across which Josephson current can tunnel, current means for producing electrical current through said first Josephson tunneling device, an electrical energy conductor connected to said first and second electrodes of said first Josephson tunneling device and terminated in an impedance which substantially eliminates reflections of electrical pulses in said conductor, a second Josephson tunneling device located adjacent said electrical energy conductor, electrical pulses in said conductor producing magnetic fields which couple to said second Josephson tunneling device.
Claim 12
Dependent Claim
26 words
The apparatus of claim 9, including a control means for said first Josephson tunneling device for controlling the voltage state of said first Josephson tunneling device.
Claim 13
Dependent Claim
51 words
The apparatus of claim 10, where said control means for said first Josephson tunneling device is comprised of at least one current carrying conductor located sufficiently close to said first Josephson tunneling device that the magnetic field produced by current in said current carrying conductor intercepts said first Josephson tunneling device.
Claim 14
Dependent Claim
59 words
The apparatus of claim 11, including a plurality of current carrying conductors for control of the voltage state of said first Josephson tunneling device, and including means for providing sequential currents and coincident currents in said current carrying lines, the combination of the magnetic fields produced by said currents determining the voltage state of said first Josephson tunneling device.
Claim 15
Dependent Claim
25 words
The apparatus of claim 9, where said electrical energy conductor is comprised of strip lines connected to the electrodes of said first Josephson tunneling device.
Claim 16
Dependent Claim
41 words
The apparatus of claim 9, including a plurality of second Josephson tunneling devices located sufficiently close to said electrical energy conductor that the magnetic field produced by electrical pulses in said conductor will intercept said plurality of second Josephson tunneling devices.
Claim 17
Dependent Claim
25 words
The apparatus of claim 9, where said termination impedance includes an open-ended transmission line for suppression of electromagnetic reflections generated in said electrical energy conductor.
Claim 18
Dependent Claim
28 words
The apparatus of claim 9, where said electrical energy conductor is a transmission line terminated in an impedance which is approximately the characteristic impedance of said transmission line.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |