2001
DOI: 10.1109/77.919545
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Versatile high performance digital SQUID electronics

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Cited by 35 publications
(25 citation statements)
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“…At an optimal bias current of I B ≅ 2 I c , the DC voltage V on a DC SQUID depends periodically on the magnetic flux Ф that passes through the SQUID loop according to the expression [14] VRnIB21(2IcIBcosπitalicΦΦ0)2, where the modulation period is equal to the magnetic flux quantum Ф 0 ≈ 2.07 × 10 −15 T·m 2 . The periodic dependence of the SQUID voltage on magnetic field can be linearized by implementing a dynamic range higher than 120 dB and a slew rate larger than 1 M Ф 0 /s using the DC SQUID control electronics, providing a digital negative feedback signal within each period and counting the periods when the magnetic flux exceeds Ф 0 [15]. …”
Section: Basic Principle Of Operation and Important Features Of Sqmentioning
confidence: 99%
“…At an optimal bias current of I B ≅ 2 I c , the DC voltage V on a DC SQUID depends periodically on the magnetic flux Ф that passes through the SQUID loop according to the expression [14] VRnIB21(2IcIBcosπitalicΦΦ0)2, where the modulation period is equal to the magnetic flux quantum Ф 0 ≈ 2.07 × 10 −15 T·m 2 . The periodic dependence of the SQUID voltage on magnetic field can be linearized by implementing a dynamic range higher than 120 dB and a slew rate larger than 1 M Ф 0 /s using the DC SQUID control electronics, providing a digital negative feedback signal within each period and counting the periods when the magnetic flux exceeds Ф 0 [15]. …”
Section: Basic Principle Of Operation and Important Features Of Sqmentioning
confidence: 99%
“…As was verified, the high-T c DC SQUID sensors are compatible with the commercially available bias-reversal DC SQUID control electronics from Tristan Technologies Inc., Cryoton Ltd., Supracon AG, Magnicon GmbH, and STL Systemtechnik Ludwig GmbH. The hybrid digital electronics provide especially high slew rate up to 5 MΦ 0 /sec, dynamic range up to about 130 dB and frequency range up to about 10 MHz for the measurement system with multilayer high-T c DC SQUIDs operating at 77 K (Ludwig et al, 2001). The above-mentioned DC SQUID electronics have the noise of preamplifier S Ve ≈ (0.2 nV) 2 /Hz.…”
Section: Performance and Noise Of High-t C Dc Squidsmentioning
confidence: 97%
“…Einzig fçr die dc-SQUIDs existieren bisher Konzepte, um eine haehere Auflaesung von bis zu 32 Bit zu erreichen [23]. Auûerdem ist der Dynamikbereich aller eingesetzten Elektroniken letztendlich durch die Eigenschaften der zur Zeit verfçgbaren 24-Bit-A/D-Wandler begrenzt.…”
Section: Vergleichunclassified