Distortion of voltage vs flux relation of dc SQUID coupled to multiturn input coil due to input coil resonance combined with capacitive-feedback effect

Keiji Enpuku, T. Minotani

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Distortion of voltage vs flux (V-Φ) relation of a dc SQUID coupled to a multiturn input coil is studied. It is shown that the so-called input coil resonance by itself does not result in the distorted V-Φ curve. Therefore, we study one more mechanism, i.e. feedback effect due to a parasitic capacitance between the input coil and the ground of the SQUID. In this case, it is shown that a feedback loop is formed for the magnetic flux, and that the distortion of the V- curve is strongly related to the stability of the feedback system. Good agreement between theory and experiment suggests that the input coil resonance combined with the capacitive feedback is the most likely mechanism for the distorted V-Φ curve of the coupled SQUID. Methods to obtain the smooth V-Φ curve are also discussed.

Original languageEnglish
Pages (from-to)419-424
Number of pages6
JournalApplied Superconductivity
Volume5
Issue number7-12
DOIs
Publication statusPublished - Jan 1 1997

Fingerprint

SQUIDs
coils
Fluxes
Feedback
Electric potential
electric potential
curves
Magnetic flux
magnetic flux
Capacitance
capacitance
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Distortion of voltage vs flux relation of dc SQUID coupled to multiturn input coil due to input coil resonance combined with capacitive-feedback effect. / Enpuku, Keiji; Minotani, T.

In: Applied Superconductivity, Vol. 5, No. 7-12, 01.01.1997, p. 419-424.

Research output: Contribution to journalArticle

@article{49faecbccd284a54b002a6d4ab5ebc21,
title = "Distortion of voltage vs flux relation of dc SQUID coupled to multiturn input coil due to input coil resonance combined with capacitive-feedback effect",
abstract = "Distortion of voltage vs flux (V-Φ) relation of a dc SQUID coupled to a multiturn input coil is studied. It is shown that the so-called input coil resonance by itself does not result in the distorted V-Φ curve. Therefore, we study one more mechanism, i.e. feedback effect due to a parasitic capacitance between the input coil and the ground of the SQUID. In this case, it is shown that a feedback loop is formed for the magnetic flux, and that the distortion of the V- curve is strongly related to the stability of the feedback system. Good agreement between theory and experiment suggests that the input coil resonance combined with the capacitive feedback is the most likely mechanism for the distorted V-Φ curve of the coupled SQUID. Methods to obtain the smooth V-Φ curve are also discussed.",
author = "Keiji Enpuku and T. Minotani",
year = "1997",
month = "1",
day = "1",
doi = "10.1016/S0964-1807(98)00064-7",
language = "English",
volume = "5",
pages = "419--424",
journal = "Applied Superconductivity",
issn = "0964-1807",
publisher = "Pergamon Press Ltd.",
number = "7-12",

}

TY - JOUR

T1 - Distortion of voltage vs flux relation of dc SQUID coupled to multiturn input coil due to input coil resonance combined with capacitive-feedback effect

AU - Enpuku, Keiji

AU - Minotani, T.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - Distortion of voltage vs flux (V-Φ) relation of a dc SQUID coupled to a multiturn input coil is studied. It is shown that the so-called input coil resonance by itself does not result in the distorted V-Φ curve. Therefore, we study one more mechanism, i.e. feedback effect due to a parasitic capacitance between the input coil and the ground of the SQUID. In this case, it is shown that a feedback loop is formed for the magnetic flux, and that the distortion of the V- curve is strongly related to the stability of the feedback system. Good agreement between theory and experiment suggests that the input coil resonance combined with the capacitive feedback is the most likely mechanism for the distorted V-Φ curve of the coupled SQUID. Methods to obtain the smooth V-Φ curve are also discussed.

AB - Distortion of voltage vs flux (V-Φ) relation of a dc SQUID coupled to a multiturn input coil is studied. It is shown that the so-called input coil resonance by itself does not result in the distorted V-Φ curve. Therefore, we study one more mechanism, i.e. feedback effect due to a parasitic capacitance between the input coil and the ground of the SQUID. In this case, it is shown that a feedback loop is formed for the magnetic flux, and that the distortion of the V- curve is strongly related to the stability of the feedback system. Good agreement between theory and experiment suggests that the input coil resonance combined with the capacitive feedback is the most likely mechanism for the distorted V-Φ curve of the coupled SQUID. Methods to obtain the smooth V-Φ curve are also discussed.

UR - http://www.scopus.com/inward/record.url?scp=0031175170&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031175170&partnerID=8YFLogxK

U2 - 10.1016/S0964-1807(98)00064-7

DO - 10.1016/S0964-1807(98)00064-7

M3 - Article

AN - SCOPUS:0031175170

VL - 5

SP - 419

EP - 424

JO - Applied Superconductivity

JF - Applied Superconductivity

SN - 0964-1807

IS - 7-12

ER -