High linearity Josephson-junction array structures

Possible approaches to synthesis of the array structures capable of providing highly linear voltage response have been studied in detail. The first way supposes synthesis of the series array by means of interferometer cells with sinusoidal response. The second one supposes synthesis of differential array structures using interferometer cells with ∣sin(x)∣-like voltage response. The interferometer cells can be replaced by parallel arrays to form a high-performance parallel-series differential structure. The traveling wave amplifier design is suggested to avoid limitations resulting from the distributed nature of the long arrays.