Title :
Observations Concerning the Generation of Spurious Tones in Digital Delta-Sigma Modulators Followed by a Memoryless Nonlinearity
Author :
Hosseini, Kaveh ; Fitzgibbon, Brian ; Kennedy, Michael Peter
Author_Institution :
Cypress Semicond., Cork, Ireland
Abstract :
In mixed-signal systems, nonlinear distortion due to nonideal analog circuitry can act on quantized digital sequences, giving rise to spurious tones. In this brief, generation of spurious tones in digital delta-sigma modulators, followed by memoryless nonlinearity, is investigated. Inherent modulator periodicity that persists even with the use of least-significant-bit dither is identified.
Keywords :
delta-sigma modulation; memoryless systems; nonlinear distortion; digital delta-sigma modulators; least-signiflcant-bit dither; memoryless nonlinearity; mixed-signal systems; modulator periodicity; nonideal analog circuitry; nonlinear distortion; quantized digital sequences; spurious tones; Delta-sigma modulation; Multi-stage noise shaping; Noise measurement; Nonlinear distortion; Phase locked loops; Quantization; Time domain analysis; Delta-sigma modulation; fractional-N frequency synthesizer; nonlinear distortion;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2011.2164960
