Abstract
Intra-coil damping is demonstrated to be an effective method for reducing resonance structure in well coupled d.c. SQUIDs with large input coils. A resistance of 1 Ω is placed across each turn of a 137 turn coil coupled to a planar washer d.c. SQUID. Non-ideal structure in the voltage–flux curve is greatly reduced, extending the range (in current bias) of satisfactory device operation. The resulting flux noise, while higher than the thermal noise limit, is less than that observed in undamped devices and can be predicted with a simple model.
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