Abstract
A low-drift directly coupled read-out electronics with broad bandwidth for dc superconducting quantum interference devices (dc SQUIDs) is presented. The electronics has a white noise level referred to the input of about 0.33 nV/Hz 1/2 and a corner frequency for the 1/ f noise as low as 0.1 Hz. The maximum bandwidth of 6 MHz was measured for systems with several types of low- T c dc-SQUID magnetometers and gradiometers. The average value of the slew rate for several types of low- T c dc-SQUID magnetometers was about 3 M Φ 0/s. The SQUID magnetometer with this type of electronics had a white flux-noise level of 1.7 μ Φ 0/Hz 1/2 and magnetic field noise level of 1.4 fT/Hz 1/2. For the gradiometer the white flux-noise level is of 5.3 μ Φ 0/Hz 1/2 and the magnetic gradient noise level is of 38 fT/mHz 1/2, correspondingly. A maximum system dynamic range of 155 dB (±50 Φ 0) for the SQUID magnetometer and 151 dB (±100 Φ 0) for the gradiometer was achieved at the white noise frequency region.
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