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Direct-coupled electronics for high-temperature superconductor DC SQUID-based magnetometer

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7 Author(s)
Gudoshnikov, S.A. ; Inst. of Terrestrial Magnetism, Ionosphere & Radiowave Propagation, Acad. of Sci., Troitsk, Russia ; Ukhansky, N. ; Vengrus, I.I. ; Matveets, L.V.
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A low-volume, high-performance, direct-coupled electronic system for high-Tc dc SQUID magnetometers has been developed and tested. This system is based on a liquid nitrogen-cooled amplifier and a modified integrator. The amplifier has a white noise voltage level close to 0.25 nVHz, a current noise of the order of 3 pAHz , a gain equal to 3000, a 3 dB bandwidth of about 370 kHz, and a package volume less than 3 cm3. The modified integrator has an input resistance of the order to 10 kΩ and a considerably high output drive current of about 30 mA. This unique combination results in the typical electronic 3 dB bandwidth of about 1 MHz, a dynamic range of ±5×106 Hz for frequencies up to 1.6 kHz, and a slew rate of 1×106 flux quanta/s in a wide signal frequency range for a middle-quality high-Tc dc SQUID sensor

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:46 ,  Issue: 2 )

Date of Publication:

Apr 1997

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