Abstract
An analytical model for a SQUID amplifier with double Josephson junctions is proposed, with an equivalent scheme representing a long transmission line loaded on the junctions via a mutual inductance that varies along the line. The results of analytical calculations agree with the results of numerical simulations. An analysis shows that load matching can be reached provided that the electrical length of a microstrip coil with an idle-run end is approximately equal to a quarter of the wavelength in the transmission line.
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Original Russian Text © O.G. Vendik, A.N. Vasil’ev, 2006, published in Pis’ma v Zhurnal Tekhnicheskoĭ Fiziki, 2006, Vol. 32, No. 7, pp. 6–13.