Integrated de SQUID magnetometer with high dV/dB

Conference · Fri Mar 01 04:00:00 EST 1991 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6092950

Drung, D; Cantor, R; Peters, M; Ryhanen, T; Kochi, H ^[1]

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1. Physikalisch-Technische Bundesanstalt, Inst. Berlin, Abbestr. 10-12, D-1000 Berlin 10 (DE)

This paper presents a directly coupled dc SQUID magnetometer with very simple feedback electronics. The magnetometer has been integrated on a 7.2 {times} 7.2 mm{sup 2} chip and fabricated using a four-level Nb/Si{sub x}N{sub v}/Nb process. Eight pick-up loops are connected in parallel to directly form the SQUID inductance of about 0.4 nH which leads to a high sensitivity B/{Phi} = 0.47 nT/{Phi}. An Additional Positive Feedback (APF) circuit on the magnetometer chip has been used to increase the gradient of the V-{mu} characteristic to dV/d{Phi} {approx equal} 300 {mu}V/{Phi}{sub 0} at the SQUID operating point. The resulting gradient of the transfer function of dV/dB {approx equal} 640 {mu}V/nT makes it possible to directly read out the SQUID without helium temperature impedance matching circuits or flux modulation techniques.

• OSTI ID: 6092950
• Report Number(s): CONF-900944--
• Conference Information: Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Journal Volume: 27:2
• Country of Publication: United States
• Language: English

Related Subjects

665411 -- Basic Superconductivity Studies-- (1992-)
665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMPLIFIERS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FABRICATION
FLUXGATE MAGNETOMETERS
FLUXMETERS
FREQUENCY MODULATION
INTEGRATED CIRCUITS
LAYERS
MAGNETIC FLUX
MAGNETOMETERS
MEASURING INSTRUMENTS
METALS
MICROELECTRONIC CIRCUITS
MICROELECTRONICS
MICROWAVE EQUIPMENT
MODULATION
NIOBIUM
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
PREAMPLIFIERS
SIGNAL-TO-NOISE RATIO
SILICON COMPOUNDS
SILICON NITRIDES
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTIVITY
TECHNOLOGY UTILIZATION
TRANSITION ELEMENTS