Abstract
A SQUID gradiometer with a glass package and trimmable additional positive feedback (APF) is developed to achieve a low equivalent flux noise over a wide range of bias current. The noise characteristics of a SQUID with APF are investigated by varying the APF gain and the bias current. We found the most suitable APF parameter to achieve low equivalent flux noise over a wide range of bias current. When a SQUID with APF has a co-planar first-order coil whose effective area is , a typical gradiometer noise level of at 100 Hz and at 1 Hz is achieved.
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