/spl Sigma/-/spl Delta/调制器非线性行为的高阶频谱分析

2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) Pub Date : 2002-11-07 DOI:10.1109/ICDSP.2002.1028270

I. Dokas, V. Tsagaris, V. Anastassopoulos

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引用次数: 0

摘要

研究了/spl Sigma/-/spl Delta/序列的高阶谱特性。为此目的，一阶单级/spl Sigma/-/spl Delta/调制器被认为具有纯正弦波输入。用双谱和双相干的方法研究了/spl σ /-/spl δ /调制器的非线性特性。这些函数揭示了量化噪声的统计特性、对信号的依赖以及信号与噪声之间的相位耦合。研究了/spl σ /-/spl δ /调制器的量化器和积分器，用不同的函数模拟了与理想行为的偏差。

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Higher order spectral analysis of nonlinear behavior in /spl Sigma/-/spl Delta/ modulator

Higher order spectral properties of /spl Sigma/-/spl Delta/ sequences are studied. For this purpose a first-order single stage /spl Sigma/-/spl Delta/ modulator is considered having as input a pure sinusoid. The nonlinear behavior of the /spl Sigma/-/spl Delta/ 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 /spl Sigma/-/spl Delta/ modulator have been studied, using different functions, to simulate the deviations from the ideal behavior.

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2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628)

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