Superconducting current injection transistor

Zeghbroeck, B.J. Van

doi:10.1063/1.94044

Cited by 39 publications

(9 citation statements)

References 11 publications

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“…The most promising results have been demonstrated by using the magnetic flux of a current to control the characteristics of a Josephson system [4,5,6,7]. These systems are commonly referred to as Vortex Flow Transistors (VFTs).…”

Section: Vortex Flow Transistorsmentioning

confidence: 99%

“…Therefore, in the CIT, there is no isolation between the input and the output which can be a problem in circuit designs. The current gain for this device has been shown to be G Z e/2AJ, where e is the length of the device and AJ is the Josephson penetration depth [7]. An analogous "discrete model" for high-temperature superconductors was not done because the mechanism of vortex motion is probably not the same as in a…”

Section: Comparison To Low-t Ljj and High-tc-devicesmentioning

confidence: 99%

“…The CIT is the continuous junction of Ref. [7]; the bracketed numbers refer to the discrete model of the continuous devices as discussed in the text. The high-T, device is the high-temperature superconducting flux flow transistor of Ref.…”

Section: Comparison To Low-t Ljj and High-tc-devicesmentioning

confidence: 99%

“…The low-T, (niobium) long Josephson junction Current Injection Transistor (CIT) [7], like the junctions in our samples, is shunted by a parallel resistor to make the device overdamped. The transport current-voltage characteristics of this device follow the RSJ model, thus its operation is similar to our devices with one major exception that the control current is actually injected into the body of the device.…”

Section: Comparison To Low-t Ljj and High-tc-devicesmentioning

confidence: 99%

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Discrete superconducting vortex flow transistors

Berman

Zant

Orlando

et al. 1994

IEEE Trans. Appl. Supercond.

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In this thesis, two versions of a Discrete Superconducting Vortex Flow Transistor (DVFT) are studied. Both overdamped and underdamped versions are fabricated with low Tc Niobium Josephson junctions. We present analytical models for the operation of the DVFTs that agree with the experimental data. In addition to the operational model of the DVFT, we also present an example of a circuit implementation of the DVFT.Measurements on the overdamped version of the DVFT indicate a current gain of 1.2 when the gate current is injected parallel to the array of junctions. With this manner of gate current injection, the gain is linear in the number of junctions and can be made much greater than 1. Measurements on the underdamped version of the DVFT indicate a transresistance of 2.8Qf with parallel gate current injection.The overdamped DVFT is better suited for circuit implementation than the underdamped version because its operation is nonlatching and is therefore less sensitive to noise.The conclusion of this thesis is that the DVFT is a viable superconducting transistor. The DVFT can be used as a building block to construct complex logic circuitry or as an interface between current based electronics, such as RSFQ logic and voltage based circuits, such as CMOS memory devices.Thesis Supervisor: Terry P. Orlando Title: Professor of Electrical Engineering

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Section: Vortex Flow Transistorsmentioning

confidence: 99%

Section: Comparison To Low-t Ljj and High-tc-devicesmentioning

confidence: 99%

Section: Comparison To Low-t Ljj and High-tc-devicesmentioning

confidence: 99%

Section: Comparison To Low-t Ljj and High-tc-devicesmentioning

confidence: 99%

See 2 more Smart Citations

Discrete superconducting vortex flow transistors

Berman

Zant

Orlando

et al. 1994

IEEE Trans. Appl. Supercond.

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“…An alternative procedure for introducing an input signal into such a device is to modulate a current injected directly into the junction counterelectrode [61][62][63]; this configuration was given the name 'superconducting current injection transistor' (SuperCIT). The basic idea here is that, as suggested by Eqs.…”

Section: Flux Flow Amplifiersmentioning

confidence: 99%

Solitons and Long Josephson Junctions

Parmentier

1993

The New Superconducting Electronics

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ABSTRACT. Magnetic flux quanta, of value h/2e, in long Josephson junctions behave as (quasi) solitons. Fluxon dynamical states are well described by a perturbed sine-Gordon equation model, with boundary conditions determined by the junction geometry and by externally applied magnetic fields, and they give rise to readily measurable physical phenomena, such as step structure in current-voltage characteristics and microwave radiation emission. Devices based on fluxon propagation offer potentially interesting applications as oscillators and amplifiers-as well as digital applications, described elsewhere in this volume-in high performance integrated superconductive circuits.

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