Stochastic simulation of SFQ logic

Satchell, J.S.

doi:10.1109/77.622070

Cited by 64 publications

(34 citation statements)

References 4 publications

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“…This circuit has been designed for the HTS ramp edge junction technology with a characteristic voltage of 600 [9]. The simulation, optimization and inductance calculations have been done with software such as Jsim, XOPT and Lmeter [10]- [12]. Simulation results show relatively large operating margins (Fig.…”

Section: B Designmentioning

confidence: 99%

HTS Pulse-Stretcher and Second Order Modulator: Design and First Results

Roussy

Karthikeyan

Oomen

et al. 2005

IEEE Trans. Appl. Supercond.

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Abstract-One of the remaining challenges in the application of superconducting electronics is the interfacing between superconducting and semiconducting environments. The voltage and speed mismatch between RSFQ pulses and semiconducting read-out electronics makes it necessary to amplify as well as stretch the RSFQ pulses. Moreover, circuits based on HTS (High Temperature Superconductor) technology are very attractive since they can operate under considerably relaxed cooling effort, which is one of the main problems with LTS (Low Temperature Superconductor) circuits.Within the European project SuperADC, a HTS second order sigma delta modulator and a pulse stretcher, used as an interface between the modulator and the first semi-conducting amplifier stage, have been designed at Twente University and will be presented here.Index Terms-HTS superconductors, Josephson junctions, rapid single flux quantum, superconducting/semiconducting interface circuits.

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Section: B Designmentioning

confidence: 99%

HTS Pulse-Stretcher and Second Order Modulator: Design and First Results

Roussy

Karthikeyan

Oomen

et al. 2005

IEEE Trans. Appl. Supercond.

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“…The work in this paper has mainly used a version of JSIM [18] with added current-noise sources [19] so the effects of temperature can be studied. JSIM outputs data sampled typically on a picosecond timescale and to generate curves we use a range of additional programs, which apply a low-pass filter to the output with an appropriate cut-off frequency, followed by data averaging, to obtain an average voltage for a set of values.…”

Section: Jsim and Jspice Analysismentioning

confidence: 99%

Self-induced Structure in the Current-Voltage Characteristics of RSQUIDs

Pegrum

Macfarlane

2009

IEEE Trans. Appl. Supercond.

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The Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Abstract-Resistive two-junction SQUIDs (RSQUIDs) made from high-temperature superconductors are being developed as narrow-linewidth tunable oscillators in the GHz frequency range. We present here the results of numerical simulation of RSQUIDs of this type. These studies have identified conditions where sub-harmonic steps and other features are apparent in the current-voltage characteristics, driven by the internally-generated heterodyne frequency. The behavior is sensitive to the frequency (set by the voltage across the resistive element in the RSQUID), the temperature and also the loop inductance. We have studied the effects of thermal noise on these features. We also assess how these effects might be observed, and consider how they might affect practical applications of high frequency heterodyne RSQUID oscillators.

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“…The noise parameter Γ = 2π k B T I 0 Φ 0 (1.8) relates the Josephson coupling energy to the thermal energy [40]. Using the Stewart-McCumber parameter β C [43,44] and normalizing the currents to I 0 , these expressions read: [45] with noise extensions [46], whose use will be explained in more detail in chapter 3. Once the critical current of the Josephson junction is reached, it starts to oscillate.…”

Section: Rcsj Model Of a Josephson Junctionmentioning

confidence: 99%

“…The extension with noise sources [46] allows to model the thermal noise of resistances. The setup used to characterize SQUIDs within JSIM is schematically shown in Fig.…”

Section: Numerical Characterization Of Squids Using Jsimmentioning

confidence: 99%

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Strongly coupled, low noise dc-SQUID amplifiers

Pleikies¹

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Stochastic simulation of SFQ logic

Cited by 64 publications

References 4 publications

HTS Pulse-Stretcher and Second Order Modulator: Design and First Results

HTS Pulse-Stretcher and Second Order Modulator: Design and First Results

Self-induced Structure in the Current-Voltage Characteristics of RSQUIDs

Strongly coupled, low noise dc-SQUID amplifiers

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