The pumpistor: a linearized model of a flux-pumped SQUID for use as a negative-resistance parametric amplifier

We describe a circuit model for a flux-driven SQUID. This is useful for developing insight into how these devices perform as active elements in parametric amplifiers. The key concept is that frequency mixing in a flux-pumped SQUID allows for the appearance of an effective negative resistance. In the...

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Bibliographic Details
Published in:arXiv.org 2013-05
Main Authors: Sundqvist, K M, Kintaş, S, Simoen, M, Krantz, P, Sandberg, M, Wilson, C M, Delsing, P
Format: Article
Language:English
Subjects:
Flux
Parametric amplifiers
Squid
Wave resistance
Online Access:Get full text
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Description
Summary:We describe a circuit model for a flux-driven SQUID. This is useful for developing insight into how these devices perform as active elements in parametric amplifiers. The key concept is that frequency mixing in a flux-pumped SQUID allows for the appearance of an effective negative resistance. In the three-wave, degenerate case treated here, a negative resistance appears only over a certain range of allowed input signal phase. This model readily lends itself to testable predictions of more complicated circuits.
ISSN:2331-8422
DOI:10.48550/arxiv.1305.7051