Performance of a flux locked series SQUID array

The operation of a SQUID array with 100 DC SQUIDs has been demonstrated using a single flux-locked loop. The SQUID array had a maximum dynamic range of +or-1.3*10/sup 8// square root (Hz) in the low frequency region, a high slewing rate over a wide frequency range, and an extrinsic white noise energ...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1993-12, Vol.3 (4), p.3061-3065
Main Authors: Foglietti, V., Stawiasz, K.G., Ketchen, M.B., Koch, R.H.
Format: Article
Language:English
Subjects:
Dynamic range
Feedback circuits
Feedback loop
Frequency
Impedance matching
Low-noise amplifiers
Operational amplifiers
SQUIDs
Temperature sensors
White noise
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Summary:The operation of a SQUID array with 100 DC SQUIDs has been demonstrated using a single flux-locked loop. The SQUID array had a maximum dynamic range of +or-1.3*10/sup 8// square root (Hz) in the low frequency region, a high slewing rate over a wide frequency range, and an extrinsic white noise energy sensitivity of 6*10/sup -31/J/Hz. These data were obtained with a very simple feedback circuit made from three inexpensive operational amplifiers that operated in the DC-feedback mode. The feedback loop did not have any impedance matching circuit between the SQUID array and the room temperature electronics. Our results show that a SQUID array can have a significant impact on those applications that demand good noise performance and a very high dynamic range.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.251805