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

Author

Gudoshnikov, Sergey A. ; Ukhansky, Nikolay ; Vengrus, Igor I. ; Matveets, Ludmila V. ; Andreev, Konstantin E. ; Snigirev, Oleg ; Krasnosvobodtsev, Sergei I.

Author_Institution

Inst. of Terrestrial Magnetism, Ionosphere & Radiowave Propagation, Acad. of Sci., Troitsk, Russia

Volume

46

Issue

2

fYear

1997

fDate

4/1/1997 12:00:00 AM

Firstpage

624

Lastpage

628

Abstract

A low-volume, high-performance, direct-coupled electronic system for high-T_c 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^-½, a current noise of the order of 3 pAHz ^-½, 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^-½ 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-T_c dc SQUID sensor

Keywords

SQUID magnetometers; high-temperature superconductors; magnetic field measurement; white noise; 1 MHz; 10 kohm; 30 mA; 370 kHz; DC SQUID-based magnetometer; current noise; direct-coupled electronics; dynamic range; high-temperature superconductor; input resistance; liquid nitrogen-cooled amplifier; output drive current; package volume; slew rate; white noise voltage level; Bandwidth; Electronic equipment testing; Frequency; High temperature superconductors; Noise level; SQUID magnetometers; Superconducting device noise; System testing; Voltage; White noise;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.571940

Filename

571940