A 4-bit Josephson computer ETL-JC1

Nakagawa, Hiroshi; Kurosawa, I.; Aoyagi, Masahiro; Kosaka, S.; Hamazaki, Yukio; Okada, Yoichi; Takada, Susumu

doi:10.1109/77.80747

Cited by 36 publications

(12 citation statements)

References 13 publications

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“…[26] They introduced a novel logic family (called 4JL) based on a gate that consists of a small loop containing four Josephson junctions. The total junction count was 22,000 and total power dissipation was 6.2 mW.…”

Section: Voltage-state Logicmentioning

confidence: 99%

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Superconductor electronics, 1986-1996

Duzer

1997

IEEE Trans. Appl. Supercond.

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This paper reviews progress in superconductor electronics over the decade since the discovery of the high temperature oxide superconductors (HTS). Almost simultaneously with that discovery was the development of a new process for low temperature superconductor (LTS) devices based on the Nb/AlOx/Nb whole wafer tunnel junction. Both of these developments facilitated a strong growth in applications. We review first the applications based on thin films with no Josephson junctions. This is mostly using HTS, which permits more convenient cooling thus making applications more commercially viable. With their need for only one or two Josephson junctions, SQUID magnetometers have succeeded to the market place using H71s materials. Finally, we review progress in the volt standard and digital circuits, both of which require large numbers of junctions and at present can only be realized with LTS materials.

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Section: Voltage-state Logicmentioning

confidence: 99%

“…The 10 Gbits/s goal is challenging for both the components and the interconnections. 26 Demonstration communication switch for optical fiber system. Detection of input data and the output amplifiers and lasers are at 77 K. The switch matrix including decoding is at 4 K. [59] VI.…”

Section: E Lts Digital Systemsmentioning

confidence: 99%

Superconductor electronics, 1986-1996

Duzer

1997

IEEE Trans. Appl. Supercond.

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“…We have already developed a superconducting integrated circuit (IC) test fixture system for a Josephson computer ETL-JC1 [1]. The system contained 40 long coaxial cables, a printed wiring board (PWB), 4 nonmagnetic sockets, and 4 chip carriers with 68 pins.…”

Section: Introductionmentioning

confidence: 99%

A GHz multi-channel cryogenic test fixture for superconducting integrated circuit testing

Aoyagi¹,

Kikuchi²,

Sato³

et al. 2003

IEEE Trans. Appl. Supercond.

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We have designed a cryogenic test fixture for functional testing of digital and analogue superconducting integrated circuits (IC) in the GHz frequency range. The test fixture consists of a ball grid array (BGA) chip carrier, a detachable BGA socket, a coaxial printed wiring board, and 40 long coaxial cables with SMA connectors. The chip carrier has a microstrip wiring and solder balls. On the chip carrier, a superconducting IC chip is connected using Al wire bonding. The wiring board has a coaxial wiring structure. The wiring characteristic impedance of the chip carrier and the print wiring board was designed to be 50 . In the BGA socket, the BGA chip carrier is electrically connected to the printed wiring board using anisotropic conductive rubber sheet. The coaxial cables are connected to the printed wiring board with soldering. All parts of the system were made with nonmagnetic materials. The high frequency characteristics were partially evaluated by TDR measurement and vector impedance measurement at 4.2 K, 77 K and room temperature.

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“…Several examples of full operating microprocessor have been realized in the past years. An example is the prototype named "4-bits Josephson computer ETL-JCl" realised at Electrotechnical Laboratory in Tsukuba (Japan) [14]. This design contains four Josephson LSI chips including register and arithmetic logic units, sequence controller, 1280-bit ROM unit and 1-Kbit random access memory bank.…”

Section: Introductionmentioning

confidence: 99%

Invited PaperJosephson readout electronics for the hybrid superconducting pixel detector

Pagano¹,

Palmieri

Mukhanov

et al. 1998

J. Phys. IV France

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a testAbstract. We have recently demonstrated the Hybrid Superconducting Pixel Detector (HSPD) principle usin, configuration. This demonstrator device consists of a semiconductive particle detector coupled to a Josephson Tunnel Junction (JTJ) acting as current sensitive discriminator. We used Minimum Ionising Particles (MIPS) as events generators. Experimental data show the first case of MIPs detection using JTJ. The efficiency of the demonstrator circuit reaches 90% with 2 MIPs and it will be improved once the complete device will be full integrated in one circuit. A second generation demonstrator, involving an eigth channel readout scheme fully implemented with superconducting electronics is being developed and will be discussed in some detail.

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A 4-bit Josephson computer ETL-JC1

Cited by 36 publications

References 13 publications

Superconductor electronics, 1986-1996

Superconductor electronics, 1986-1996

A GHz multi-channel cryogenic test fixture for superconducting integrated circuit testing

Invited PaperJosephson readout electronics for the hybrid superconducting pixel detector

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