A novel double DC SQUID device has been developed. It consists of two SQUIDs in a cascade configuration with the same electrical parameters but with a different geometry. This structure makes the device particularly suitable for flux-locked-loop operation without need for modulation flux. Consequently the readout electronic scheme is greatly simplified without degrading the noise performance of the first stage. The first DC SQUID has a gradiometer configuration with extra damping resistors shunting the inductance. The technology used is similar to the seven-layer IBM process with planar Nb-Nb/sub 2/O/sub 5/-PbAuIn junctions and 2.5- mu m minimum size lithography.
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Foglietti et al. (1991) studied this question.
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