Title :
Smart SQUIDs based on relaxation oscillation SQUIDs
Author :
Van Duuren, M.J. ; Brons, G.C.S. ; Flokstra, J. ; Rogalia, H.
Author_Institution :
Dept. of Appl. Phys., Twente Univ., Enschede, Netherlands
fDate :
6/1/1999 12:00:00 AM
Abstract :
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.
Keywords :
SQUIDs; analogue-digital conversion; detector circuits; digital readout; superconducting device noise; superconducting particle detectors; white noise; 100 MHz; digital readout; double relaxation oscillation SQUIDs; flux locked loop; internal clock; linear operation flux range; multichannel SQUID systems; pulsed output structure; single chip; smart SQUIDs; superconducting up-down counter; white noise level; Bandwidth; Clocks; Counting circuits; Critical current; Frequency locked loops; Hysteresis; Physics; SQUIDs; Temperature; Wires;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
