High-frequency characterization of thin-film Y-Ba-Cu oxide superconducting transmission lines

Dykaar, D. R.; Sobolewski, Roman; Chwalek, James M.; Whitaker, J.F.; Hsiang, Thomas Y.; Mourou, G.; Lathrop, D. K.; Russek, Stephen E.; Buhrman, R. A.

doi:10.1063/1.99692

Cited by 67 publications

(7 citation statements)

References 6 publications

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“…At this time numerical simulation and also desktop computer models are available to define the influence of superconducting electrodes on travelling wave FET behaviour. However an exhaustive study to define optimum components could only be performed after the new high Tc thin film superconductors will have been characterized precisely in the microwave frequency range [20]. It must also be noted that the use of superconductors in slow wave structures can only be promising under the condition that temperature and frequency behaviours of its conductivity are similar to those for NbN.…”

Section: Discussionmentioning

confidence: 99%

Analytical Models and Theoretical Analysis of Superconducting Coplanar Lines

Seguinot

Kinowski

Pribetich

et al. 1991

Journal of Electromagnetic Waves and Applications

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Prospective study of the influence of superconducting strips in various coplanar waveguides is proposed using a transmission line model designed in an engineering purpose for CAD programs. This model is tested using a comparison of the results obtained, with the propagation characteristics of superconducting coplanar lines determined with a modified spectral domain approach. For insulating coplanar waveguides the use of YBaCuO instead of classical low temperature NbN superconductor provides lower losses at higher operating temperatures.In superconducting MIS or Schottky contact lines, superconductor losses are negligible as compared to semiconductor losses for transverse dimensions as low as 1 µ. For example, 1 µ gate length FET type structures operated at 77 K exhibit 50 Ω constant characteristic impedance with associated constant slowing factor, and losses lower than 4 dB/mm up to 20 GHz. Similar propagation characteristics can be obtained with different superconductors providing that current transport in superconductor is dominated by the kinetic inductance effect. The influence of temperature is also discussed.

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Section: Discussionmentioning

confidence: 99%

Analytical Models and Theoretical Analysis of Superconducting Coplanar Lines

Seguinot

Kinowski

Pribetich

et al. 1991

Journal of Electromagnetic Waves and Applications

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“…Electrooptic sampling technique has also been applied for high frequency characterization of thin-film high temperature superconducting transmission lines [5]. Distortion-free propagation of high current density transient has been demonstrated.…”

Section: Discussionmentioning

confidence: 99%

Picosecond Optoelectronics And Millimeter-Wave Technology

Lee

1988

SPIE Proceedings

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“…The successful SFQ data transfer between superconducting chips was recently reported by Herr et al [13]. High-frequency characterization of YBa Cu O (YBCO) transmission lines was discussed by Dykaar et al [14]. In this paper, we optimize the for the latching driver by calculating the punchthrough probability of both LTS and high-temperature superconductor (HTS) junctions based on measured junction characteristics and propose the MCM structure with LTS-SFQ circuits and latching drivers with an optimum to realize high-speed SFQ systems.…”

Section: Introductionmentioning

confidence: 93%

Output Interface With Latching Driver for LTS-SFQ Circuits

Hato

Horibe

Wakana

et al. 2005

IEEE Trans. Appl. Supercond.

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We propose an output interface with a latching driver for single-flux-quantum (SFQ) circuits operating at 4.2 K. An optimum critical current density of the latching driver was discussed, and a multichip module (MCM) structure with SFQ circuits and latching drivers was proposed for 40-Gb/s operation. To optimize of the latching driver, we calculated the punchthrough probability of Nb-Al-AlO -Nb junctions and high-temperature superconductor (HTS) junctions. The Nb junction with a of 45 kA/cm 2 , which has a hysteresis of 44% for the latching operation, leads to a punchthrough probability lower than 10 15 for an ideal ac-bias of 40 GHz. On the other hand, ramp-edge-type interface-modified junctions based on YBa 2 Cu 3 O 7 have an optimum of 60 kA/cm 2 that gives the smallest punchthrough probability lower than 10 15 for an ideal ac-bias of 40 GHz without any shunt capacitance. Because the optimum of 45 kA/cm 2 for the latching driver is too large to fabricate large-scale integrated SFQ circuits with the Nb junction, the MCM structure consisting of SFQ circuits and latching drivers with the optimum is important to prepare 40-Gb/s SFQ systems. The of 60 kA/cm 2 is a practical value for the HTS junctions, and use of the low-temperature superconductor (LTS)-HTS MCM structure is also one way to realize the high-speed SFQ systems.Index Terms-Interface circuit, latching driver, multichip module (MCM), punchthrough, single-flux quantum (SFQ).

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High-frequency characterization of thin-film Y-Ba-Cu oxide superconducting transmission lines

Cited by 67 publications

References 6 publications

Analytical Models and Theoretical Analysis of Superconducting Coplanar Lines

Analytical Models and Theoretical Analysis of Superconducting Coplanar Lines

Picosecond Optoelectronics And Millimeter-Wave Technology

Output Interface With Latching Driver for LTS-SFQ Circuits

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