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Advanced version of two-stage dc SQUID-based amplifier

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8 Author(s)
Kirichenko, D.E. ; Dept. of Phys., Moscow State Univ., Russia ; Pavolotskij, A.B. ; Prokhorova, I.G. ; Saigirev, O.V.
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An advanced version of a two stage dc SQUID-based low frequency amplifier and its measured signal and noise parameters are presented in this report. An effective input inductance of about 2.9 /spl mu/H, a SQUID's inductance of about 11 pH, an effective coupling k/sup 2/ of about 0.24 and a white noise level of about 0.87 /spl mu//spl Phi//sub 0//Hz/sup 1/2/ at 4.2 K were achieved. The gradiometric scheme, a modified distributed damping filter and a modified geometry of coupling transformers have been used to suppress the influences of the external noise and resonances in the SQUID microstructure.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )