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Performance of dc SQUIDs with resistively shunted inductance (1989)

Foglietti, V. ; Gallagher, W. J. ; Ketchen, M. B. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 55 (1989), S. 1451-1453

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We have fabricated and characterized the noise performance of well-coupled Nb-Pb alloy edge junction dc superconducting quantum interference devices (SQUIDs) with a resistively shunted inductance. The extra damping resistor removes the resonances in the current-voltage characteristics resulting in a very low value of the extrinsic energy sensitivity in flux-locked-loop operation. Numerical simulations, with the junction capacitance included, indicate that the damping resistance does not degrade noise performance until it is significantly less than the junction-shunting resistance. We also tested different SQUID designs and demonstrated that a large SQUID inductance, proposed earlier to be desirable when resistively shunted, can seriously affect the low-frequency flux noise.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.101583

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