FLUX-1 RSFQ microprocessor: Physical design and test results

Bunyk, P.; Leung, M.; Spargo, J.W.; Dorojevets, Mikhail

doi:10.1109/tasc.2003.813890

Cited by 52 publications

(27 citation statements)

References 9 publications

(5 reference statements)

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“…1 and 4) in contrast to the design methods reported in [5] and [6]. By doing so, we avoid using explicit PTL-connectable splitters which would add three more JJs (corresponding to a driver-receiver pair) for each signal splitting.…”

Section: A Ptl-connectable Logic Cell and Circuit Design Methodsmentioning

confidence: 99%

Design and Investigation of Gate-to-Gate Passive Interconnections for SFQ Logic Circuits

Hashimoto

Yorozu

Kameda

et al. 2005

IEEE Trans. Appl. Supercond.

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We have developed a method of designing single-fluxquantum (SFQ) logic circuits with passive gate-to-gate interconnections. Based on our method, we designed a 2 2 switch in which all the interconnections are implemented with passive transmission lines (PTLs) while short Josephson transmission line (JTL) segments are used only to adjust the signal timings. Compared with an identical switch using JTL interconnections, the switch using PTL interconnections has 45% fewer wiring junctions and requires 48% less wiring power current. The switch operated at 40 GHz with a bias margin of 9.5%.

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Section: A Ptl-connectable Logic Cell and Circuit Design Methodsmentioning

confidence: 99%

Design and Investigation of Gate-to-Gate Passive Interconnections for SFQ Logic Circuits

Hashimoto

Yorozu

Kameda

et al. 2005

IEEE Trans. Appl. Supercond.

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“…nonsuperconductive connection middle-scale RSFQ devices have been reported up to now operating at clock frequencies of only few tens GHz (Bunyk et al, 2003;Tanaka et al, 2007). The big gap between the speed performance of the simple and the middle-scale RSFQ digital devices is tightly connected to the complicated global clock distribution network of the complex synchronous RSFQ digital circuits.…”

Section: Basics Of the Rsfq Digital Electronicsmentioning

confidence: 99%

The asynchronous rapid single-flux quantum electronics – a promising alternative for the development of high-performance digital circuits

et al. 2008

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Abstract. In this paper, we investigate the application of the asynchronous logic approach for the realization of ultra highspeed digital electronics with high complexity. We evaluate the possible physical, technological, and schematical origins of restrictions limiting such an application, and propose solutions for their overcoming. Although our considerations are based on the rapid single-flux quantum technique, the conclusions derived can be generalized about any type of digital information coding.

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“…Although this characteristic of the SFQ logic circuits makes it suitable for deep pipelining [6], designers of the SFQ circuits are required to adjust the timing of signals and clock inputs to all logic gates very precisely. The precision of the clock supplied to all logic gates is particularly important, and sophisticated clocking schemes for the SFQ logic circuits have been developed to optimally design high-speed SFQ logic circuits [7]. Because of these reasons, there are only a few professional designers who can design large-scale SFQ logic circuits.…”

Section: Introductionmentioning

confidence: 99%

Superconductive combinational logic circuit using magnetically coupled SQUID array

Yamanashi

Umeda

Sai

2010

Physica C: Superconductivity and its Applications

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a b s t r a c tIn this paper, we propose the development of superconductive combinational logic circuits. One of the difficulties in designing superconductive single-flux-quantum (SFQ) digital circuits can be attributed to the fundamental nature of the SFQ circuits, in which all logic gates have latching functions and are based on sequential logic. The design of ultralow-power superconductive digital circuits can be facilitated by the development of superconductive combinational logic circuits in which the output is a function of only the present input. This is because superconductive combinational logic circuits do not require determination of the timing adjustment and clocking scheme. Moreover, semiconductor design tools can be used to design digital circuits because CMOS logic gates are based on combinational logic. The proposed superconductive combinational logic circuits comprise a magnetically coupled SQUID array. By adjusting the circuit parameters and coupling strengths between neighboring SQUIDs, fundamental combinational logic gates, including the AND, OR, and NOT gates, can be built. We have verified the accuracy of the operations of the fundamental logic gates by analog circuit simulations.

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FLUX-1 RSFQ microprocessor: Physical design and test results

Cited by 52 publications

References 9 publications

Design and Investigation of Gate-to-Gate Passive Interconnections for SFQ Logic Circuits

Design and Investigation of Gate-to-Gate Passive Interconnections for SFQ Logic Circuits

The asynchronous rapid single-flux quantum electronics – a promising alternative for the development of high-performance digital circuits

Superconductive combinational logic circuit using magnetically coupled SQUID array

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