The Variable Hysteresis Band in Delta-Sigma Modulation (original) (raw)

This paper presents a technique for the variation of hys-teresis band in delta-sigma modulation. A sinusoidal, and a random hys-tersis band are combined to achieve an optimal performance in terms of constant switching frequency and the harmonic spikes. The sinusoidal hys-teresis band technique produces a constant switching frequency while the random hysteresis band suppresses the harmonic spikes. The effects of var-ious variations of hysteresis band on the harmonic spectrum characteristic were described. The technique is experimented in a single-phase inverter and the harmonic peaks and the distortion of output voltage were used to measure the performance of the proposed technique. key words: delta-sigma modulation, sinusoidal hysteresis band, random hysteresis band