Smart SQUIDs based on relaxation oscillation SQUIDs

Smart SQUIDs based on double Relaxation Oscillation SQUIDs (DROS) and a superconducting up-down counter have been developed. DROS and counter form a flux locked loop on one single chip. The DROS output consists of a series of pulses that controls the two up and down write gates of the counter. The p...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 1999-06, Vol.9 (2), p.2919-2922
Hauptverfasser:	van Duuren, M.J., Brons, G.C.S., Flokstra, J., Rogalia, H.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Bandwidth Chip formation Clocks Counting circuits Critical current Devices Electronics Exact sciences and technology Flux Frequency locked loops Hysteresis Physics Relaxation oscillations Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices SQUIDs Superconducting devices Superconducting quantum interference devices Superconductivity Temperature Wires
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Beschreibung
Zusammenfassung:	Smart SQUIDs based on double Relaxation Oscillation SQUIDs (DROS) and a superconducting up-down counter have been developed. DROS and counter form a flux locked loop on one single chip. The DROS output consists of a series of pulses that controls the two up and down write gates of the counter. The pulsed output structure of the DROS constitutes the internal clock for this single-chip device. Several prototypes were built with a clock frequency of 100 MHz, a linear operation flux range of about 2.5 /spl Phi//sub 0/, and a white noise level of 6.5 /spl mu//spl Phi//sub 0///spl radic/Hz. The smart SQUID is in principle a promising device for application in multichannel SQUID systems.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/77.783641