Versatile high performance digital SQUID electronics

Author

Ludwig, C. ; Kessler, C. ; Steinforc, A.J. ; Ludwig, W.

Author_Institution

STL Systemtechnik Ludwig GmbH, Konstanz, Germany

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1122

Lastpage

1125

Abstract

The digital SQUID Electronics DSE32 has been developed to perform software gradiometry with SQUID magnetometers in multi-channel systems using both High-T_c and Low-T_c SQUIDs. A low-noise preamplifier is followed by a fast hybrid feedback-loop, combining the bandwidth of an analog feedback-loop with the accuracy of a digital loop. By resetting and counting of flux quanta in the SQUID, the dynamic range has been substantially increased. All parameters of SQUID and electronics are firmware controlled and allow for auto-setup and tuning. Data are transferred with a rate of 20 Mbit/s by means of noise-minimizing, bi-directional optical fiber. Low power consumption allows the use of a battery, further reducing external noise pick-up. The electronics layout is designed for multi-channel applications, as needed in biomagnetic systems

Keywords

SQUID magnetometers; 20 Mbit/s; DSE3; SQUID magnetometer; auto-setup; biomagnetic system; data transfer; digital SQUID electronics; dynamic range; firmware control; high-T_c superconductor; hybrid feedback loop; low power operation; low-T_c superconductor; low-noise preamplifier; multi-channel system; optical fiber; software gradiometry; tuning; Bandwidth; Bidirectional control; Dynamic range; Microprogramming; Optical fibers; Optical noise; Optical tuning; Preamplifiers; SQUID magnetometers; Software performance;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919545

Filename

919545