Title :
Higher order spectral analysis of nonlinear behavior in Σ-Δ modulator
Author :
Dokas, I. ; Tsagaris, V. ; Anastassopoulos, V.
Author_Institution :
Electron. Lab., Patras Univ., Greece
Abstract :
Higher order spectral properties of Σ-Δ sequences are studied. For this purpose a first-order single stage Σ-Δ modulator is considered having as input a pure sinusoid. The nonlinear behavior of the Σ-Δ modulator is examined by means of the bispectrum and the bicoherence. These functions reveal the statistical properties of the quantization noise, its dependence on the signal as well as the phase coupling between the signal and the noise. The quantizer and the integrator of the Σ-Δ modulator have been studied, using different functions, to simulate the deviations from the ideal behavior.
Keywords :
noise; quantisation (signal); sigma-delta modulation; spectral analysis; Σ-Δ sequences; bicoherence; bispectrum; first-order single stage Σ-Δ modulator; higher order spectral analysis; integrator; nonlinear behavior; phase coupling; quantization noise; sinusoid input; statistical properties; Delta modulation; Flip-flops; Frequency; Laboratories; Phase noise; Physics; Probability density function; Quantization; Spectral analysis; Transfer functions;
Conference_Titel :
Digital Signal Processing, 2002. DSP 2002. 2002 14th International Conference on
Print_ISBN :
0-7803-7503-3
DOI :
10.1109/ICDSP.2002.1028270
