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Bias conditions of dc-SQUIDs for a time-domain SQUID multiplexer

Published

Author(s)

Joern Beyer, Dietmar Drunge, Kent D. Irwin

Abstract

SQUID multiplexers can be used to read out arrays of cryogenic microcalorimeters and bolometers. Time-domain dc-SQUID multiplexer configurations use an individual first-stage dc-SQUID for each detector of an array. The biasing conditions of these first-stage SQUIDs significantly affect the performance of the SQUID multiplexer. We analyze the bias conditions of the first-stage SQUIDs in terms of the total multiplexer noise and bandwidth. We present an analysis and experimental study of the operational parameters of a first-stage dc-SQUID under varied vias conditions. This analysis includes a direct measurement of the SQUID dynamic resistance and the flux noise of the SQUID biased over the range from voltage bias to current bias. Our measurements show that a matched bias of the first-stage SQUIDs improves the system noise performance as well as the first-stage bandwidth.
Citation
Review of Scientific Instruments
Volume
75

Keywords

microcalorimeter, multiplexer, SQUID

Citation

Beyer, J. , Drunge, D. and Irwin, K. (2004), Bias conditions of dc-SQUIDs for a time-domain SQUID multiplexer, Review of Scientific Instruments, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31440 (Accessed June 17, 2024)

Issues

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Created January 31, 2004, Updated October 12, 2021