Title :
Integrated two stage dc SQUID-based amplifier with double transformer coupling scheme
Author :
Kirichenko, D.E. ; Pavolotskij, A.B. ; Snigirev, O.V. ; Mezzena, R. ; Vitale, S. ; Beljaev, A.V. ; Maslennikov, Yu.V.
Author_Institution :
Dept. of Phys., Moscow State Univ., Russia
fDate :
6/1/1997 12:00:00 AM
Abstract :
The integrated version of a two stage dc SQUID-based low frequency amplifier has been designed, fabricated and tested. The value of the gain of the applied flux d/spl Phi//sub SQ2//d/spl Phi//sub SQ1/ in the range 30-70 and an overall flux-to-voltage transfer factor d/spl Phi//sub SQ2//d/spl Phi//sub SQ1/ as high as 3 mV//spl Phi//sub 0/ have been obtained. An effective input inductance L/sub IN/ equal to 1.8 /spl mu/H, a current sensitivity 1.33 /spl mu/A//spl Phi//sub 0/, and an effective coupling coefficient k/sup 2//sub IN/ close to 0.1 have been found in the accordance with the design.
Keywords :
SQUIDs; amplifiers; superconducting transformers; coupling coefficient; current sensitivity; double transformer coupling; flux-to-voltage transfer factor; gain; input inductance; integrated two stage DC SQUID low frequency amplifier; Circuits; Coils; Energy resolution; Inductance; Noise level; Physics; Preamplifiers; SQUIDs; Semiconductor device noise; Thermal resistance;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
