Generating low-distortion ternary signals using an imperfect DAC and ADC chain

In this paper, the problem of generating ternary signals with high spectral purity using imperfect equipment is addressed. In particular, a low-cost setup comprised of a non-uniform digital-to-analog converter (DAC), an analog filter, and a non-uniform analog-to-digital converter (ADC) is considered. First, the effect of DAC nonlinearity on the spectrum of randomized constrained sequences (RCS) is described and validated. Then, based on this effect, a method for generating RCS signals with high spectral purity is proposed. The feasibility of this method is evaluated by numerical simulations and experimental tests.