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Design and Optimization of Fully Digital SQUID Based on Bi-Directional RSFQ

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Abstract

Bi-directional RSFQ benefits from using both positive and negative SFQ pulses to manipulate and transfer digital data. This allows more flexibility in the design of simpler circuits with enhanced performance. On the other hand, using the AC bias current, one can replace on-chip resistive current distributors with inductors. This resembles RQL logic, but in contrast to RQL, it is possible to use the well-established standard RSFQ cells in bi-directional RSFQ. These two advantages (energy-efficient computation and flexibility in design) make bi-directional RSFQ a powerful tool in next-generation supercomputers and also compatible with ultra-low-temperature quantum computers. In this work, to show the power and simplicity of circuits in bi-directional RSFQ, a fully digital SQUID based on bi-directional RSFQ is designed and optimized. The circuit we show here is a delta modulating ADC with digital integrator. The circuit has fewer Josephson junctions than other reported circuits, which makes the proposed circuit more easily realizable in available LTc and HTc technologies.

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  1. http://www.fluxonics-foundry.de.

References

  1. Likharev, K.K., Semenov, V.K.: RSFQ logic/memory family: a new Josephson-junction technology for sub-terahertz-clock-frequency digital systems. IEEE Trans. Appl. Supercond. 1, 3–28 (1991)

    Article  ADS  Google Scholar 

  2. Landauer, R.: Irreversibility and heat generation in the computing process. IBM J. Res. Dev. 5(3), 183–191 (1961)

    Article  MathSciNet  MATH  Google Scholar 

  3. Mukhanov, O.A.: Energy-efficient single flux quantum technology: applied superconductivity. IEEE Trans. Appl. Supercond. 21(3), 760–769 (2011)

    Article  ADS  Google Scholar 

  4. Herr, Q.P., Herr, A.Y., Oberg, O.T., Ioannidis, A.G.: Ultra-low-power superconductor logic. J. Appl. Phys. 109(10), 103109 (2011)

    Article  Google Scholar 

  5. Gupta, D., Inamdar, A.A., Kirichenko, D.E., Kadin, A.M., Mukhanov, O.A.: Superconductor analog-to-digital converters and their applications. IEEE MTT-S Int. Microw. Symp. Dig. 1(4), 5–10 (2011)

    Google Scholar 

  6. Reich, T., Ortlepp, Th., Uhlmann, F.H.: Digital SQUID sensor based on SFQ technique. IEEE Trans. Appl. Supercond. 15(2), 304–307 (2005)

    Article  Google Scholar 

  7. Reich, T.: Experimental analysis of digital SQUID devices at 4.2 K. Supercond. Sci. Technol. 18, 1077–1081 (2005)

    Article  ADS  Google Scholar 

  8. Celik, M.E., Bozbey, A.: A statistical approach to delay, jitter and timing of signals of RSFQ wiring cells and clocked gates. IEEE Trans. Appl. Supercond. 23(3), 1701305 (2013)

    Article  Google Scholar 

  9. Haverkamp, J., Mielke, O.: Linearity of a digital SQUID magnetometer. IEEE Trans. Appl. Supercond. 21(3), 705–708 (2011)

    Article  ADS  Google Scholar 

Download references

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Author notes

  1. Farshad Foroughi

    Present address: 2nd Institute of Physics, RWTH University, Aachen, Germany

Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, Sharif University of Technology, Tehran, Iran

    Farshad Foroughi & Mehdi Fardmanesh

  2. Department of Electrical and Electronics Engineering, TOBB University of Economics and Technology, Ankara, Turkey

    Ali Bozbey

Authors
  1. Farshad Foroughi
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  2. Ali Bozbey
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  3. Mehdi Fardmanesh
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Correspondence to Farshad Foroughi.

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Foroughi, F., Bozbey, A. & Fardmanesh, M. Design and Optimization of Fully Digital SQUID Based on Bi-Directional RSFQ. J Supercond Nov Magn 27, 1623–1628 (2014). https://doi.org/10.1007/s10948-014-2501-8

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  • DOI: https://doi.org/10.1007/s10948-014-2501-8

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