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Performance of a flux locked series SQUID array

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4 Author(s)
Foglietti, V. ; IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA ; Stawiasz, K.G. ; Ketchen, M.B. ; Koch, R.H.

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.<>

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:3 ,  Issue: 4 )

Date of Publication:

Dec. 1993

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