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IEEE Transactions on Electron Devices

Issue 10 • Oct. 1980

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  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): c1
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  • Foreword

    Publication Year: 1980, Page(s):1855 - 1856
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  • Josephson-logic devices and circuits

    Publication Year: 1980, Page(s):1857 - 1869
    Cited by:  Papers (24)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1520 KB)

    A review of the recent advances in Josephson logic devices and circuits is presented. The Josephson junction is almost an ideal digital switch exhibiting very abrupt threshold, ultra-high switching speeds (∼10 ps), and very low power dissipation (∼1 µW). Logic devices based on the Josephson junctions combine Josephson junctions with other circuit elements to provide isolation to t... View full abstract»

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  • Memory-cell design in Josephson technology

    Publication Year: 1980, Page(s):1870 - 1882
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2704 KB)

    Operating principles and criteria for the design of Josephson memory cells are reviewed and the evolution of cell design is retraced to highlight the various constraints imposed by the requirement for high speed, density, large Operating margins, and ease of auxiliary memory circuit design. Two attractive cells have emerged so far. One is a nondestructive readout (NDRO) ring cell for a subnanoseco... View full abstract»

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  • Margins of a 16-ps/bit interferometer shift register

    Publication Year: 1980, Page(s):1882 - 1887
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Static and dynamic properties of an interferometer with five equal Josephson junctions are investigated as a single-flux quanta shift-register model. A flux quantum is stored in any loop without a bias current or magnetic field. A flux quantum is shifted from one interferometer loop to the adjacent one by applying a magnetic-field control pulse only to one in terferometer loop at a time. Shift cur... View full abstract»

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  • Analog-to-digital conversion with unlatched SQUID's

    Publication Year: 1980, Page(s):1887 - 1896
    Cited by:  Papers (58)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    Digital Josephson circuits that do not latch into the voltage state provide an opportunity for high-speed serial processing. These fast logic gates must ultimately generate and record small fast pulses generated by single fluxoid events. This is demonstrated in a concept for a high-speed analog-to-digital (A/D) converter. Low β-value unlatched SQUID's are used throughout for ultimate speed, s... View full abstract»

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  • Advances in SQUID magnetometers

    Publication Year: 1980, Page(s):1896 - 1908
    Cited by:  Papers (17)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1715 KB)

    The operation and noise limitations of de and RF SQUID's are outlined, and recent advances in their sensitivity are discussed. A model of the dc SQUID predicts an energy noise level per hertz referred to the SQUID of approximately8 k_{B}TL/R approx 8 k_{B}T(piLC)^{1/2}, whereL, R,andCare the SQUID inductance and the shunt resistance and capacitance of each Josephso... View full abstract»

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  • Superconductive devices for millimeter wave detection, mixing, and amplification

    Publication Year: 1980, Page(s):1909 - 1920
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1469 KB)

    Single-particle (quasi-particle) tunneling through an insulating barrier between two superconductors or between a superconductor and a normal conductor is being used to make very-low-noise detectors and mixers for millimeter wavelengths. The nonlinearity of theI-Vcurve obtained from tunneling between two superconductors can be so strong that classical theory breaks down and photon-assis... View full abstract»

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  • Josephson-junction mixer analysis using frequency-conversion and noise-correlation matrices

    Publication Year: 1980, Page(s):1921 - 1928
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    A complete characterization and optimization have been carried out for an externally pumped Josephson-junction mixer. A noise-driven nonlinear pump equation is first solved in the time domain on a computer in order to obtain a conversion matrix and noise-correlation matrix for the small-signal current and voltage. A set of linear circuit equations formed by the matrices is then solved in the frequ... View full abstract»

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  • Externally pumped millimeter-wave Josephson-junction parametric amplifier

    Publication Year: 1980, Page(s):1928 - 1934
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    A unified theory of the singly and doubly degenerate Josephson-junction parametric amplifier is presented. Experiments with single junctions on both amplifier modes at frequencies 10, 35, and 70 GHz are discussed. Low-noise temperature (∼100 K, single sideband (SSB)) and reasonable gain (∼8 dB) were obtained at 35 GHz in the singly degenerate mode. On the basis of the theory and experi... View full abstract»

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  • Microwave theory of Josephson oscillators

    Publication Year: 1980, Page(s):1934 - 1944
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    In this paper, we deal with a model of a specific Josephson microwave circuit, that of a Josephson oscillator, and show that the RF behavior of a real Josephson oscillator may be predicted from a knowledge of the experimentally measured microwave circuit parameters, the junction critical current, and junction shunt resistance. Based on observations made with an electronic analog, we present an app... View full abstract»

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  • Picosecond applications of Josephson junctions

    Publication Year: 1980, Page(s):1945 - 1965
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2504 KB)

    The behavior of simple superconducting circuits in the picosecond regime is described in a comprehensive way, with primary emphasis being given to the step function and pulse responses of these circuits. Topics receiving detailed discussion include Josephson-junction modeling with both the microscopic and shunted-junction models. Limitations of the shunted-junction model are explored by comparing ... View full abstract»

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  • Minimum-width control-current pulse for Josephson logic gates

    Publication Year: 1980, Page(s):1965 - 1973
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (845 KB)

    For a given level of overdrive, there exists a minimum-width control-current pulse that must be applied to switch a Josephson logic gate. Determination of this minimum pulsewidth is useful in setting limits on the speed of various Josephson circuit configurations and also in finding the narrowest pulse that a Josephson-junction gate can detect when it is employed as a pulse detector. The minimum c... View full abstract»

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  • Vortex motion modulated by a self field in a large Josephson junction

    Publication Year: 1980, Page(s):1973 - 1978
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (625 KB)

    Motion of a vortex array (flux flow) in a large Josephson junction is studied both theoretically and experimentally. An expression for dc current-voltage (I-V) characteristics of a large junction in a flux-flow state, which is caused by the external dc magnetic field and current, is obtained by taking account of the self field due to the dc current through the junction as well as the la... View full abstract»

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  • High-reliability Pb-alloy Josephson junctions for integrated circuits

    Publication Year: 1980, Page(s):1979 - 1987
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1400 KB)

    The process developed and recently used at IBM for fabricating experimental Pb-alloy Josephson tunnel-junction devices, and the factors which influence the stability of such devices during repeated cycling between 300 and 4.2 K are reviewed. A new, fine-grained Pb0.84In0.12Au0.04alloy base electrode material has been developed that has excellent thermal cycling sta... View full abstract»

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  • An ellipsometric study of the RF sputter oxidation of lead—indium alloys

    Publication Year: 1980, Page(s):1988 - 1997
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1104 KB)

    A simple ellipsometer and an inexpensive 13-MHz sputteretch assembly have been used with a conventional evaporator to make in, situ measurements of the growth of thin oxide layers (≤ 10 nm) on pure lead and pure indium films, and also on a series of alloy films containing up to 46 at % In. Our lead results agree with results of earlier workers. For pure indium, we find that equilibrium oxide... View full abstract»

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  • Niobium oxide-barrier tunnel junction

    Publication Year: 1980, Page(s):1998 - 2008
    Cited by:  Papers (33)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1353 KB)

    We describe the fabrication and electrical characteristics of niobium oxide-barrier tunnel junctions having counterelectrodes of either Pb alloys or Nb. The conditions necessary to obtain good tunnel barriers are discussed in detail. These include RF plasma etching of the Nb film before oxidation, the oxidation step itself and, in the case of Nb counterelectrodes, exposure of the oxide to an RF pl... View full abstract»

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  • Advanced superconducting materials for electronic applications

    Publication Year: 1980, Page(s):2009 - 2015
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Recent progress in the fabrication of tunnel junction with the high-Tctransition-metal compound and transition-metal alloy superconductors is reviewed. The potential advantages of these materials for practical applications are described and their special problems assessed. It is found that, based on work to date, Nb3Sn may have practical device potential. View full abstract»

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  • Josephson devices coupled by semiconductor links

    Publication Year: 1980, Page(s):2016 - 2026
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1448 KB)

    A review of the field of semiconductor-barrier Josephson junctions is presented. In recent years, several materials which had not previously been used as Josephson barriers have been investigated. The use of both single-crystal and novel amorphous materials has confirmed that relatively thick semiconductor barriers can support large Josephson current densities. Although the fabrication technology ... View full abstract»

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  • A new Josephson junction with a very short barrier length and a very low capacitance

    Publication Year: 1980, Page(s):2027 - 2029
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Josephson junctions of a new geometrical structure were fabricated and have turned out to be of good quality. They are almost-planar niobium-based bismuth-barrier Josephson junctions which have a barrier length of 75 nm and a capacitance of 0.04 pF. The amplitudes of the zero-voltage current and microwave-induced constant-voltage current steps periodically vanish several times as the power of the ... View full abstract»

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  • Ultrasmall superconducting tunnel junctions

    Publication Year: 1980, Page(s):2030 - 2031
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Extremely small-area superconducting Josephson junctions have been fabricated using a newly developed electron-beam lithography technique. The junctions are composed of Pb-In base electrodes and Pb counter electrodes. Areas of the junctions range from 1 to 3 × 10-10cm2. The estimated capacitance is ∼10-15F. Junctions have been produced with resistances o... View full abstract»

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  • The maximum zero-voltage tunnel current and its fluctuations for lead—lead oxide—lead Josephson tunnel junctions

    Publication Year: 1980, Page(s):2031 - 2033
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (451 KB)

    The maximum zero-voltage tunnel current I0and its fluctuations were measured for Josephson tunnel junctions as a function of the normal state resistanceRin the range of 50-300 Ω atT = 4.2K. The junctions, based on pure lead, have areas of about 100 µm2, corresponding to capacitancesCof about 3 pF. The results obtained from a simple n... View full abstract»

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  • Fabrication of Nb variable-thickness- and point-contact-type bridges by means of microfabrication technology

    Publication Year: 1980, Page(s):2033 - 2035
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Niobium-based techniques for fabrication of two different types of metal-coupled Josephson junctions are presented. Electrical characteristics are reported and it is noted that the device resistance is an order of magnitude or more higher than would be expected for both devices. View full abstract»

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  • Proposal of single-flux-quantum logic device

    Publication Year: 1980, Page(s):2035 - 2036
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    A new type of logic gate that can be designed using a nonhysteretic Josephson weak link is proposed. The basic component of the proposed device is a one-junction interferometer, and a logic state is represented by either a zero or a single-flux-quantum. In contrast to the "Parametric Quantron," this device is designed to operate without a three-phase clock and the dependence of the junction critic... View full abstract»

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  • [Back cover]

    Publication Year: 1980, Page(s): c4
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    Freely Available from IEEE

Aims & Scope

IEEE Transactions on Electron Devices publishes original and significant contributions relating to the theory, modeling, design, performance and reliability of electron and ion integrated circuit devices and interconnects.

 

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Giovanni Ghione
Politecnico di Torino,
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