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Advanced Squid Read-Out Electronics

  • Chapter
SQUID Sensors: Fundamentals, Fabrication and Applications

Part of the book series: NATO ASI Series ((NSSE,volume 329))

Abstract

Superconducting quantum interference devices (SQUIDs) are the most sensitive devices for measuring weak magnetic fields. Beside the SQUID itself, the design of the read-out electronics decisively determines the performance of the whole sensor. In standard read-out electronics, a cooled impedance-matching transformer between SQUID and preamplifier, and a flux modulation technique are employed. Recently, several novel SQUID read-out concepts without flux modulation have been developed, mainly for biomagnetic multichannel systems. This chapter gives a description and comparison of the most important ones: concepts using multiple SQUIDs, SQUIDs with additional positive feedback, relaxation oscillation SQUIDs, and digital SQUIDs. Both the noise and the dynamic behavior are discussed, and a simple model for the achievable speed of a directly-coupled feedback loop without flux modulation is presented, which allows one to estimate the dynamic merits of the various SQUID concepts.

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  1. Physikalisch-Technische Bundesanstalt, Abbestrasse 2-12, D-10587, Berlin, Germany

    Dietmar Drung

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  1. Dietmar Drung
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  1. Air Force Office of Scientific Research, Washington, DC, USA

    Harold Weinstock

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© 1996 Springer Science+Business Media Dordrecht

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Drung, D. (1996). Advanced Squid Read-Out Electronics. In: Weinstock, H. (eds) SQUID Sensors: Fundamentals, Fabrication and Applications. NATO ASI Series, vol 329. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5674-5_2

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  • DOI: https://doi.org/10.1007/978-94-011-5674-5_2

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