The introduction of passive-transmission-line (PTL) wiring to large-scale SFQ logic circuits offers several advantages over traditional Josephson-transmission-line (JTL) wiring, such as smaller area, less delay, lower power consumption, and more freedom in routing. PTL can drastically change the style designing circuits. We propose a new methodology for using wiring. Aiming at generalizing circuit design, we chose synchronous clocking. developed placer that was suitable design assist us with...

We developed a design approach for interface circuits to connect Single Flux Quantum (SFQ) cells by using passive transmission lines (PTL's). In the approach, an circuit between PTL and JTL is optimized obtain standard circuit, then, modifications are made previously designed SFQ PTL's. The key point use of approximately same with every cell maintain matching condition Based on this we test composed two D-flip-flops connected 2-mm-long PTL's via circuits. impedance was 2 /spl Omega/....

The supply of bias current is one the key problems to be overcome for fully operational large-scale SFQ circuits. Large currents cause various undesirable effects that degrade circuit operation. magnetic field induced by a large DC affects operation several cells, even with microstrip-line structure applied lines. In this paper, experimental results using SQUIDs show bias-line shielding most effective way reduce effect current. operating margins cells were also found sensitive in ground...

We report on development of a cryocooled system prototype for high-throughput single flux quantum (SFQ) digital applications. The was designed to have 32 I/O links with bandwidth 10 Gbps/port. An SFQ multi-chip module (MCM), double mu-metal magnetic shields, 40-K radiation shield, customized GaAs cryogenic amplifiers, 32-pin wide-bandwidth cryo-probe, and cables were packaged in vacuum chamber together two-stage 4-K 1-W Gifford-McMahon (G-M) cryocooler. S-parameter measurements showed that...

The number of photovoltaic (PV) power systems being installed worldwide has been increasing. This resulted in maintenance an adequate balance between demand and supply becoming a great concern for system operators. Forecasting PV outputs is promising countermeasure that garnering significant interest. Conventional methods achieving this often use learning methods, such as neural networks support vector regression. In contrast, paper proposes short-term power-forecasting method geographically...

Dual-rail logic circuit elements based on rapid single-flux-quantum (RSFQ) technology have been designed and simulated. The proposed circuits can operate asynchronously, since dual-rail data include timing information in themselves. Therefore scheme has a possibility of solving some problems RSFQ with flow clocking, which would become more serious as operating speed complexity the increase. Implementation AND XOR cells is described. A transfer-ring from flow-clocked to parallel also...

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

We designed and fabricated a 4 /spl times/ switch in which all interconnections were implemented using passive transmission lines (PTLs). The consisted of four identical 2 switches connected PTLs. was gate-to-gate interconnections. Using the on-chip testing method, we demonstrated 40-GHz operation switch. To verify effectiveness interconnection, compared with an that Josephson (JTLs) for comparison showed PTL-version had 50% fewer junctions required 55% less powering current. latency largest...

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

Superconducting devices have intrinsically superior characteristics to those of semiconductor devices. Presently, we can fabricate more than twenty thousand junctions on one chip using niobium technology. We demonstrated the operation a network system with superconducting interconnection voltage-state logic. Single flux quantum are promising for future applications because clock frequency SFQ logic is higher that voltage-state. proposed high-end switch based hybrid architecture optical...

A single-flux-quantum (SFQ) device provides fast operation with low power consumption. As SFQ devices can be applied in network switches requiring high throughput, we have been developing an switch system. Not only the fabric but also scheduler is a key component for high-throughput switch. The orders multiple inputs to single output at same time prevent collisions from occurring fabric. scheduling becomes longer as number of ports increases, because must scan requests all input ports. We...

Photon counting imaging can be used to capture clearly photon-limited scenes. In photon imaging, information on incident photons is obtained as binary frames (bit-plane frames), which are transformed into a multi-bit image in the reconstruction process. this process, it necessary apply deblurring method enable of dynamic scenes without motion blur. article, for high-quality bit-plane frame proposed. The proposed involves units object within scene through application compensation pixels...

We present a primitive-level pipelining method in rapid single-flux-quantum (RSFQ) technology. In RSFQ circuits, binary information is represented by discrete voltage pulses unlike levels CMOS and related circuits. The utilizes inherent storage capability primitives as pipeline registers. propose new primitive that carries out operation, holds the result, controls output. As three tasks are performed one primitive, it expected to eliminate interconnect delays inevitable if separate used....

We have been developing a single-flux-quantum (SFQ) cross-bar switch, which is main component of network packet switch. think that switch an application in the high speed SFQ technology would be advantageous. Anticipating general and large-scale logic circuit design, we used cell-based design method CONNECT standard cell library. The two-input two-output core component, consists 13 cells connected by Josephson-transmission-line (JTL) cells. Because large size JTL delay them, timing...

We present a pulse-driven asynchronous logic gate family based on high-speed, low-power Josephson-junction device of rapid single-flux-quantum (RSFQ) circuits. Dual-rail is used and clock-free operation realized. The proper the circuits confirmed by numerical simulation which shows delays are about 60 ps for an AND 80 XOR. Power consumption estimated to be 10 /spl mu/W/gate.

This paper proposes a novel lossless image coding method which directly estimates probability distribution of intensity values on pel-by-pel basis. In the estimation process, several examples, i.e. set pels whose neighborhoods are similar to local texture target pel be encoded, gathered from search window located an already encoded part same image. Then is modeled as weighted sum Gaussian functions center positions given by individual examples. Furthermore, model parameters that control...

We previously proposed a lossless image coding method based on examples search and probability model optimization. In this paper, we improve efficiency of the by introducing an adaptive prediction technique. Specifically, multiple affine predictors are trained pel-by-pel using causal neighbor pels, predicted values obtained those used for generating model. Therefore, both non-local information local together in modeling. Furthermore, optimization number is also paper. Experimental results...

We present two versions of self-timed pipelined parallel carry-look-ahead adders. The adders are designed based on delay-insensitive (DI) rapid single-flux-quantum (RSFQ) primitives. Basic binary gates employ dual-rail encoded data, which include timing information in themselves. One version uses wave pipelining and the other with a request-acknowledge data transfer protocol. show simulation results 4 to 32-bit their sensitivity delay variations. Two design schemes compared terms area,...

With regard to sustaining future capacity of network traffic, the current hardware technology has a big bottleneck in terms power consumption and insufficient operation speed. To overcome this bottleneck, we have developed single flux quantum (SFQ) packet-switching circuit. We report recent progress developing SFQ application. First, demonstrate 40 GHz, 160 Gb/s, 4 /spl times/ packet switching circuit, which is currently fastest clock frequency reported switch. Then, describe possible module...

We demonstrated the 4 /spl times/ 4-cross/bar-40 Gbps/ch switch which is functionally compatible with a commercial semiconductor one in order to evaluate current SFQ circuit technology quantitatively both operating speed and power consumption. According our numerical simulations, has or two orders of magnitude higher throughput per single channel than that semiconductor, much smaller exchanging times between routing paths. In an actual test based on NEC Nb-2.5 kA/cm/sup 2/ junction...