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Proceedings of the IEEE

Issue 8 • Date Aug 1989

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Displaying Results 1 - 16 of 16
  • Potential methods for the fabrication of high-Tc superconductors for wires and cables

    Publication Year: 1989 , Page(s): 1124 - 1131
    Cited by:  Papers (1)  |  Patents (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (700 KB)  

    Studies of practical properties, such as upper critical field (HC2) and critical-current density, of high-T c oxide superconductors of Y-Ba-Cu-O Bi-Sr-Ca-Cu-O, and Tl-Ba-Ca-Cu-O systems are reviewed. The Hc2 of these materials is much higher than that of conventional metallic superconductors, indicating a high potential for practical applications,... View full abstract»

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  • Principles and applications of SQUIDs

    Publication Year: 1989 , Page(s): 1208 - 1223
    Cited by:  Papers (23)  |  Patents (14)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1640 KB)  

    An overview of the current status of DC and RF SQUIDs (superconducting quantum interference devices) is presented. Using Nb-based thin-film technology, a number of groups can now routinely fabricate DC SQUIDS with input circuits integrated on the same chip. At 4.2 K, the DC SQUID, which operates with a constant bias current, can detect signals with an equivalent energy per unit bandwidth of a few ... View full abstract»

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  • Superconducting magnets and their applications

    Publication Year: 1989 , Page(s): 1132 - 1142
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1260 KB)  

    Superconducting magnets are now being used in such diverse applications as medical imaging, fusion research, and power conditioning. Steady improvement in the understanding of instability and quenching has allowed increases in current density and compactness of winding. The resulting reduction in winding size has allowed the construction of economical magnets for imaging, acceleration, and high-re... View full abstract»

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  • Application of superconductors to motors, generators, and transmission lines

    Publication Year: 1989 , Page(s): 1143 - 1154
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1060 KB)  

    Two specific applications of superconductors are considered: electric machinery (motors and generators) and transmission lines. Development work carried out with respect to both types of equipment indicates that the use of superconductors is feasible, even if only liquid-helium-cooled superconductors are considered. The high-T c superconductors will have a beneficial impact on ... View full abstract»

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  • Flux transfer devices

    Publication Year: 1989 , Page(s): 1280 - 1286
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (552 KB)  

    Flux transfer device theory is reviewed. In such devices, generalized magnetic flux, defined as the time integral of voltage, is used to describe the device characteristics. The Josephson junction and inductor are the main circuit elements in flux transfer devices, because they maintain a constant value for the time integral of voltage. Flux transfer devices are based on either an RF SQUID (superc... View full abstract»

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  • High-temperature superconductive thin films

    Publication Year: 1989 , Page(s): 1155 - 1163
    Cited by:  Papers (10)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (804 KB)  

    The material and physical properties of the new high-temperature copper oxide superconductors relevant to electronic device applications are reviewed. The various approaches to their synthesis in useful thin-film form are discussed and the properties of films made by the various techniques are compared, as are results from the principal high-temperature superconductors. It is argued that, because ... View full abstract»

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  • Superconducting components for infrared and millimeter-wave receivers

    Publication Year: 1989 , Page(s): 1233 - 1246
    Cited by:  Papers (25)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1316 KB)  

    The superconducting components developed for infrared and millimeter-wave receivers are reviewed. A brief description is given of the scientific principles on which each device is based, followed by a discussion of the performance that has been achieved in terms of the appropriate figures of merit. Comments are made about the possibility that useful device performance can be achieved by using the ... View full abstract»

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  • Niobium-based integrated circuit technologies

    Publication Year: 1989 , Page(s): 1164 - 1176
    Cited by:  Papers (11)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1744 KB)  

    Metallurgical and electrical properties of Nb and NbN films for use as Josephson junction electrodes and wiring layers are investigated. The crystallographic and superconducting properties necessary for Nb-based integrated circuit processes are clarified. Tunnel barrier structures of NbN-Nb oxide-NbN (Pb alloy) and Nb-Al oxide-Nb Josephson junctions have been analyzed and correlated with junction ... View full abstract»

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  • Josephson memory technology

    Publication Year: 1989 , Page(s): 1194 - 1207
    Cited by:  Papers (17)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1224 KB)  

    Memory circuit architecture (decoder, cell, cell array, and sense circuit) is surveyed, with emphasis on implementing a memory with fast access and low power consumption. Recent progress in fabrication and circuit technology has improved memory performance. An AC powering scheme, instead of the earlier DC system, has been developed. The AC powering scheme eliminates complicated timing control, whi... View full abstract»

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  • Superconductive analog signal processing devices

    Publication Year: 1989 , Page(s): 1247 - 1263
    Cited by:  Papers (26)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1436 KB)  

    Real-time signal processing is important in many emerging applications in areas such as pulse-compression radar, spread-spectrum communications, and electronic warfare. The required digitally equivalent computational rate for these applications is on the order of 102 arithmetic operations per second and the required instantaneous bandwidths could approach 10 GHz. These exceed by nearly ... View full abstract»

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  • Superconductor-semiconductor hybrid devices, circuits, and systems

    Publication Year: 1989 , Page(s): 1287 - 1301
    Cited by:  Papers (8)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1344 KB)  

    The discovery of superconductors whose critical temperatures are above liquid nitrogen temperature has prompted considerable interest in hybrid superconducting-semiconducting electronics applications. The authors review the efforts to hybridize these technologies. Some of these efforts have already been demonstrated on a laboratory scale; others are at present just theoretical proposals. Hybridiza... View full abstract»

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  • Digital logic circuits

    Publication Year: 1989 , Page(s): 1177 - 1193
    Cited by:  Papers (27)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1464 KB)  

    Recent progress in Josephson digital logic circuits is described. It is noted that changing the junction material from a lead alloy to niobium has dramatically improved process reliability, and that high-speed, low-power operations have been demonstrated at large-scale integrated-circuit levels. The first Josephson microprocessor, operated at 770 MHz, verified the potential of Josephson devices fo... View full abstract»

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  • Standards and high-speed instrumentation

    Publication Year: 1989 , Page(s): 1224 - 1232
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (840 KB)  

    The authors review four applications of superconductivity of current interest in metrology. These applications are Josephson series-array voltage standards, cryogenic current comparators, a superconducting sampling oscilloscope, and a novel bolometer based on a kinetic inductance thermometer View full abstract»

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  • Josephson shift registers

    Publication Year: 1989 , Page(s): 1274 - 1279
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (420 KB)  

    A review of Josephson shift-register circuits that have been designed, fabricated, or tested is presented with emphasis on work in the 1980s. Operating speed is most important, since it often limits system performance. Older designs used square-wave clocks, but most modern designs use offset sine waves, with either two or three phases. Operating margins and gate bias uniformity are key concerns. T... View full abstract»

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  • Superconductive A/D converters

    Publication Year: 1989 , Page(s): 1264 - 1273
    Cited by:  Papers (23)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (852 KB)  

    A number of superconductive A/D (analog/digital) converter designs that show promise for superiority in high-bandwidth or high-resolution applications are known. On the high-resolution side, counting-type converters appear quite attractive. Voltage-to-frequency and tracking A/D converters are reviewed in this category. On the ultra-high-bandwidth side (greater than about 1 GHz) the parallel-type A... View full abstract»

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  • Conventional wire and cable technology

    Publication Year: 1989 , Page(s): 1110 - 1123
    Cited by:  Papers (1)  |  Patents (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2568 KB)  

    The present state of the art of practical bulk superconductors is reviewed. The recent developments in high-current density fine-filament NbTi conductors are dealt with at length. The improvements achieved can be applied to the full range of different product forms of monofilamentary NbTi. These are described together with the fabrication methods used to produce them. Three practical fabrication t... View full abstract»

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H. Joel Trussell
North Carolina State University