Analysis Of The Accuracy Of Digital Sinewave Generator With Step-Linear Approximation

The paper presents the analysis of the absolute error of a digital sinewave generator with step linear approximation. The initial data for the synthesis of the sinewave (number of linear sections and number of steps in a section) are chosen according to a specified value of the amplitude error. Calculations are made for the first linear section, the angle coefficients of the other linear sections and the amplitudes of the end points of the sections. In this way is synthesized only the first quarter of the sinewave. The symmetry of the sinewave is used for the synthesis of the full cycle wave. The investigations show that the magnitude of the absolute error depends strongly on the number of linear sections and the number of steps in a section