Influence of the signal coil on DC-squid dynamics

Heikki Seppä, Tapani Ryhänen

Research output: Contribution to journalArticleScientific

9 Citations (Scopus)

Abstract

The dynamics of the dc-SQUID in the presence of a signal coil was studied. The signal coil creates an additive parasitic capacitance between the junctions and its self-resonance imports new features to the SQUID dynamics. Our results suggest that if a SQUID with smooth characteristics and low noise properties is desired, all the resonances present in the SQUID ring or in the flux coupling circuit should be damped properly. Low attenuation yields a system with high gain but with higher excess noise. On the other hand, heavy damping of the device yields low gain and a high noise level and thus a compromise is necessary.
Original languageEnglish
Pages (from-to)1083-1086
JournalIEEE Transactions on Magnetics
Volume23
Issue number2
DOIs
Publication statusPublished - 1987
MoE publication typeB1 Article in a scientific magazine

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SQUIDs
Coupled circuits
Capacitance
Damping
Fluxes

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Seppä, Heikki ; Ryhänen, Tapani. / Influence of the signal coil on DC-squid dynamics. In: IEEE Transactions on Magnetics. 1987 ; Vol. 23, No. 2. pp. 1083-1086.
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Influence of the signal coil on DC-squid dynamics. / Seppä, Heikki; Ryhänen, Tapani.

In: IEEE Transactions on Magnetics, Vol. 23, No. 2, 1987, p. 1083-1086.

Research output: Contribution to journalArticleScientific

TY - JOUR

T1 - Influence of the signal coil on DC-squid dynamics

AU - Seppä, Heikki

AU - Ryhänen, Tapani

PY - 1987

Y1 - 1987

N2 - The dynamics of the dc-SQUID in the presence of a signal coil was studied. The signal coil creates an additive parasitic capacitance between the junctions and its self-resonance imports new features to the SQUID dynamics. Our results suggest that if a SQUID with smooth characteristics and low noise properties is desired, all the resonances present in the SQUID ring or in the flux coupling circuit should be damped properly. Low attenuation yields a system with high gain but with higher excess noise. On the other hand, heavy damping of the device yields low gain and a high noise level and thus a compromise is necessary.

AB - The dynamics of the dc-SQUID in the presence of a signal coil was studied. The signal coil creates an additive parasitic capacitance between the junctions and its self-resonance imports new features to the SQUID dynamics. Our results suggest that if a SQUID with smooth characteristics and low noise properties is desired, all the resonances present in the SQUID ring or in the flux coupling circuit should be damped properly. Low attenuation yields a system with high gain but with higher excess noise. On the other hand, heavy damping of the device yields low gain and a high noise level and thus a compromise is necessary.

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DO - 10.1109/TMAG.1987.1065125

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JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

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