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Design and analysis of high-T/sub c/ SQUID current amplifiers

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2 Author(s)
Hildebrandt, G. ; Dept. of the Fundamentals & Theory of Electr. Eng., Tech. Univ. of Ilmenau, Germany ; Uhlmann, H.F.

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.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 2 )