High sensitivity double relaxation oscillation superconducting quantum interference devices
- 14 November 1994
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 65 (20) , 2606-2608
- https://doi.org/10.1063/1.112582
Abstract
Double relaxation oscillationsuperconducting quantum interference devices(SQUIDs) (DROSs) have been fabricated with estimated relaxation frequencies up to 14 GHz. Both the intrinsic flux noise and the performance in a flux locked loop with direct voltage readout have been studied. In flux locked loop, a noise level of 0.55 μφ0/√Hz corresponding to an energy sensitivity of 34 h has been obtained for a DROS with a SQUIDinductance of 29 pH. The intrinsic sensitivity improves with increasing relaxation frequency, leveling off to a value of 13 h at relaxation frequencies higher than about 3 GHzKeywords
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