Superconducting Shuttle-Flux Shift Register for Race Logic and Its Applications

Bautista, Meriam Gay; Gonzalez-Guerrero, Patricia; Lyles, Darren; Michelogiannakis, George

doi:10.1109/tcsi.2022.3210023

Title: Superconducting Shuttle-Flux Shift Register for Race Logic and Its Applications

Journal Article · Mon Oct 10 00:00:00 EDT 2022 · IEEE Transactions on Circuits and Systems I: Regular Papers

DOI:https://doi.org/10.1109/tcsi.2022.3210023· OSTI ID:2326971

^[1]; Gonzalez-Guerrero, Patricia ^[1]; Lyles, Darren ^[1];

^[1]

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Applied Mathematics and Computational Research Division

Here this paper presents a superconducting, magnetically-coupled, shuttle-flux shift register (SF-SR) that stores single flux quantum (SFQ) pulses. This shift register has a DC bias operating margin of ±34% at 10 GHz, with a power dissipation of 3.6 μW and 38% fewer Josephson junctions (JJs) when scaled up to multiple stages compared to a data flip-flop (DFF) based shift register. The clock input is inductively coupled and is independent from the data input. We then present three applications for our SF-SR. In the first application, we add two non-destructive readout (NDRO) cells to construct a buffer that temporarily stores the temporal information of a series of race logic (RL) pulses. The second application is a pseudo-random number generator based on a linear function shift register (LFSR). The third application is N parallel SF-SRs that can act similar to a deserializer or instead can emulate a single SF-SR of N times higher clock frequency. These three applications motivate deep shift registers with many shifting intervals, which our SF-SR can implement with fewer JJs and lower power consumption compared to DFF-based shift registers.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2326971

Journal Information:: IEEE Transactions on Circuits and Systems I: Regular Papers, Vol. 70, Issue 1; ISSN 1549-8328

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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Title: Superconducting Shuttle-Flux Shift Register for Race Logic and Its Applications

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