High-Tc Superconducting Quantum Interference Device with Additional Positive Feedback
Summary :
This study shows that using the direct offset integration technique (DOIT) and additional positive feedback (APF) in a high-Tc dc superconducting quantum interference device (SQUID) improves the effective flux-to-voltage transfer function and reduces the flux noise of a magnetometer, thus improving the magnetic field noise. The effective flux-to-voltage transfer function and the flux noise with APF were measured at different values of the positive feedback parameter βa, which depends on the resistance of the APF circuit. These quantities were also compared between conditions with and without APF. This investigation showed that a βa condition the most suitable for minimizing the flux noise of a magnetometer with APF exists and that it is βa=0.77. The effective flux-to-voltage transfer function with APF is about three times what it is without APF (93 µV/Φ0 vs. 32 µV/Φ0). The magnetic field noise of a magnetometer with APF is improved by a factor of about 3 (242 fT/
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E78-C No.5 pp.519-525
- Publication Date
- 1995/05/25
- Publicized
- Online ISSN
- DOI
- Type of Manuscript
- Special Section PAPER (Special Issue on Superconducting Electronics and Its Applications)
- Category
- SQUID sensor and multi-channel SQUID system
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Akira ADACHI, Ken'ichi OKAJIMA, Youichi TAKADA, Saburo TANAKA, Hideo ITOZAKI, Haruhisa TOYODA, Hisashi KADO, "High-Tc Superconducting Quantum Interference Device with Additional Positive Feedback" in IEICE TRANSACTIONS on Electronics,
vol. E78-C, no. 5, pp. 519-525, May 1995, doi: .
Abstract: This study shows that using the direct offset integration technique (DOIT) and additional positive feedback (APF) in a high-Tc dc superconducting quantum interference device (SQUID) improves the effective flux-to-voltage transfer function and reduces the flux noise of a magnetometer, thus improving the magnetic field noise. The effective flux-to-voltage transfer function and the flux noise with APF were measured at different values of the positive feedback parameter βa, which depends on the resistance of the APF circuit. These quantities were also compared between conditions with and without APF. This investigation showed that a βa condition the most suitable for minimizing the flux noise of a magnetometer with APF exists and that it is βa=0.77. The effective flux-to-voltage transfer function with APF is about three times what it is without APF (93 µV/Φ0 vs. 32 µV/Φ0). The magnetic field noise of a magnetometer with APF is improved by a factor of about 3 (242 fT/
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e78-c_5_519/_p
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@ARTICLE{e78-c_5_519,
author={Akira ADACHI, Ken'ichi OKAJIMA, Youichi TAKADA, Saburo TANAKA, Hideo ITOZAKI, Haruhisa TOYODA, Hisashi KADO, },
journal={IEICE TRANSACTIONS on Electronics},
title={High-Tc Superconducting Quantum Interference Device with Additional Positive Feedback},
year={1995},
volume={E78-C},
number={5},
pages={519-525},
abstract={This study shows that using the direct offset integration technique (DOIT) and additional positive feedback (APF) in a high-Tc dc superconducting quantum interference device (SQUID) improves the effective flux-to-voltage transfer function and reduces the flux noise of a magnetometer, thus improving the magnetic field noise. The effective flux-to-voltage transfer function and the flux noise with APF were measured at different values of the positive feedback parameter βa, which depends on the resistance of the APF circuit. These quantities were also compared between conditions with and without APF. This investigation showed that a βa condition the most suitable for minimizing the flux noise of a magnetometer with APF exists and that it is βa=0.77. The effective flux-to-voltage transfer function with APF is about three times what it is without APF (93 µV/Φ0 vs. 32 µV/Φ0). The magnetic field noise of a magnetometer with APF is improved by a factor of about 3 (242 fT/
keywords={},
doi={},
ISSN={},
month={May},}
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TY - JOUR
TI - High-Tc Superconducting Quantum Interference Device with Additional Positive Feedback
T2 - IEICE TRANSACTIONS on Electronics
SP - 519
EP - 525
AU - Akira ADACHI
AU - Ken'ichi OKAJIMA
AU - Youichi TAKADA
AU - Saburo TANAKA
AU - Hideo ITOZAKI
AU - Haruhisa TOYODA
AU - Hisashi KADO
PY - 1995
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E78-C
IS - 5
JA - IEICE TRANSACTIONS on Electronics
Y1 - May 1995
AB - This study shows that using the direct offset integration technique (DOIT) and additional positive feedback (APF) in a high-Tc dc superconducting quantum interference device (SQUID) improves the effective flux-to-voltage transfer function and reduces the flux noise of a magnetometer, thus improving the magnetic field noise. The effective flux-to-voltage transfer function and the flux noise with APF were measured at different values of the positive feedback parameter βa, which depends on the resistance of the APF circuit. These quantities were also compared between conditions with and without APF. This investigation showed that a βa condition the most suitable for minimizing the flux noise of a magnetometer with APF exists and that it is βa=0.77. The effective flux-to-voltage transfer function with APF is about three times what it is without APF (93 µV/Φ0 vs. 32 µV/Φ0). The magnetic field noise of a magnetometer with APF is improved by a factor of about 3 (242 fT/
ER -
English
