Title :
Design and analysis of high-T/sub c/ SQUID current amplifiers
Author :
Hildebrandt, G. ; Uhlmann, H.F.
Author_Institution :
Dept. of the Fundamentals & Theory of Electr. Eng., Tech. Univ. of Ilmenau, Germany
fDate :
6/1/1997 12:00:00 AM
Abstract :
SQUID preamplifiers are very sensitive and have a low noise level. We present simulation studies for asymmetric voltage biased SQUID current amplifiers with one superconducting layer. For a simple SQUID amplifier the gain has been calculated versus the loop and noise parameter. An optimum of the gain versus the loop parameter has been obtained. For a parallel SQUID array amplifier a design rule has been derived. The possible margins for the critical current have been calculated. The inductance values used in the simulations have been calculated by a 3D field program from an assumed layout.
Keywords :
SQUIDs; high-temperature superconductors; preamplifiers; superconducting device noise; 3D field; asymmetric voltage bias; critical current; design; gain; high-T/sub c/ SQUID current amplifier; inductance; loop parameter; noise parameter; parallel array; preamplifier; simulation; superconducting layer; Circuit noise; Critical current; Frequency; Inductance; Josephson junctions; Power generation; Quantum capacitance; SQUIDs; Temperature; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
