How to build up the high linearity SQIF structure

Abstract

The synthesis of SQIF structures capable of providing highly linear voltage response has been studied in detail. It has been shown that the high linearity SQIF structure ought to involve a set of the connected in series arrays which provide periodic triangular voltage responses with different periods. Such a SQIF shows voltage response characterized by a single high-amplitude triangular peak. One has proposed the basic array structures implementing interferometer cells with cosine-like voltage response. The array response linearity dependence on number of the cells has been studied by means of the spectrum analysis technique. The synthesized SQIF structure allows designing of wide-band high-linear amplifiers for gigahertz frequency range. A travelling wave amplifier design is suggested to avoid limitations resulting from distributive character of the long series array.