Successful operation of single-flux-quantum 2×2 unit switch

Kameda, Yusuke; Yorozu, Shinichi; Hidaka, Mutsuo; Tahara, S.

doi:10.1016/s0921-4534(02)01758-6

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…Single Flux Quantum (SFQ) circuits are a promising technology for the application to processors [1], [2], network switches [3], AD converters and so on [4]. Among them, the applications to measurement instruments is important, because they use the strong points of the SFQ circuits: high-speed operation, low noise and high-sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of SFQ programmable clock generators

Ito

Nakajima

Fujiwara

et al. 2004

Physica C: Superconductivity

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We have designed and implemented an SFQ programmable clock generator (PCG), which can generate variable length of SFQ pulses according to its internal state. PCG is composed of an SFQ ring oscillator, a control circuit, which counts up the number of SFQ pulses and stops the operation of the ring oscillator, and a decoder, which defines the initial state of the control circuit. PCG can generate the variable number of SFQ pulses ranging 2 ~ 2 N bits, where N is the number of T flip-flop in the control circuit. The oscillation frequency of PCG is designed to be ranging from 6.2 GHz to 18.8 GHz. In this study, we have implemented PCG generating SFQ pulses ranging 2 ~ 2 4 bit using a cell-based design methodology and confirmed its correct functionality.

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Section: Introductionmentioning

confidence: 99%

Design and implementation of SFQ programmable clock generators

Ito

Nakajima

Fujiwara

et al. 2004

Physica C: Superconductivity

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“…Many component circuits such as network switches, microprocessors and analog-to-digital converters have been demonstrated. [2][3][4][5][6][7][8][9][10][11][12][13][14][15] However, it is noted that highspeed operation becomes more difficult as the circuit scale increases. One of the main reasons for this is the Josephson transmission lines (JTLs), which are used as interconnects in SFQ circuits.…”

Section: Introductionmentioning

confidence: 99%

Flexible Superconducting Passive Interconnects with 50-Gb/s Signal Transmissions in Single-Flux-Quantum Circuits

Yamada¹,

Ryoki²,

Fujimaki³

et al. 2006

jjap

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We have developed a very flexible wiring technique of passive transmission lines (PTLs) in single-flux-quantum (SFQ) circuits. For high flexibility, we introduced two types of wiring structures of strip lines (SLs) and microstrip lines (MSLs) using the fabrication process which has four metal layers. The SLs and MSLs are realized using the second and fourth metal layers as signal lines, respectively, from the bottom (the other two metal layers are used as ground planes). We also introduced via-holes for transmission between the SL and MSL. For solving the problem of impedance mismatch on complicated discontinuous sections such as joints [between the driver(receiver) and the end of SLs(MSLs)] and via-holes, we optimized the structures of these discontinuous sections and evaluated propagation properties to ensure high-speed transmission of SFQ pulses. We tested the transmission of SFQ pulses through SLs/MSLs including more than 50 via-holes, one of the most complicated lines in actual designs. We confirmed the good propagation properties of SFQ pulses up to 50 Gb/s with sufficiently wide bias margins of ±20% to be used in practical designs.

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“…On the other hand, the single-flux-quantum (SFQ) circuits are known to have high potential for integration with very low power consumption [1][2][3][4]. Therefore, high data throughput and low latency can be obtained simultaneously in the SFQ-integrated circuits, and the SFQ circuits are thought to be suitable for constructing the NSWs [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…The most important issue is how to reduce an internal blocking rate of the packets in a distribution network. A rate transfer circuit including a speed-up buffer is proposed as a solution by NEC [6,9]. For example, four parallel packets at an input rate of 10 Gb s −1 are transformed into four serial packets at an output rate of 40 Gb s −1 in the speed-up buffer.…”

Section: Introductionmentioning

confidence: 99%

On-chip test of the shift register for high-end network switch based on cell-based design

Yamada

Sekiya

Akahori

et al. 2001

Supercond. Sci. Technol.

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We have demonstrated the high-speed operation up to 55 GHz with a bias margin of ±5.5% for a shift register based on the single-flux-quantum logic circuit. The shift register is employed in the rate transfer circuit in high-end network switches that are made up with the cell-based design technique. The on-chip test system was used for measuring the operation frequencies, and the test system itself was built by combining the cells to satisfy the boundary conditions between the test system and the circuit-under-test. As a result, the on-chip test system developed in this study has high flexibility.

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Successful operation of single-flux-quantum 2×2 unit switch

Cited by 8 publications

References 7 publications

Design and implementation of SFQ programmable clock generators

Design and implementation of SFQ programmable clock generators

Flexible Superconducting Passive Interconnects with 50-Gb/s Signal Transmissions in Single-Flux-Quantum Circuits

On-chip test of the shift register for high-end network switch based on cell-based design

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