Title :
Comments on efficient dithering in digital delta-sigma modulator
Author :
Hongjia Mo ; Kennedy, Michael Peter
Author_Institution :
Sch. of Eng.-Electr. & Electron. Eng., Univ. Coll. Cork & Tyndall Nat. Inst., Cork, Ireland
Abstract :
The output spectra of digital delta sigma modulators (DDSMs) are characterized by unwanted spurious periodic tones (spurs). Additive pseudorandom dither is used to whiten the quantization noise of the DDSM in order to minimize these spurs. Unfortunately, pseudorandom dither signals are themselves periodic and may cause other spurs to appear. This paper describes a DDSM architecture with multiple periodic dither inputs and explains the limits of its performance.
Keywords :
delta-sigma modulation; quantisation (signal); DDSM architecture; additive pseudorandom dither; digital delta-sigma modulator; multiple periodic dither inputs; quantization noise; unwanted spurious periodic tones; Delta-sigma modulation; Frequency synthesizers; Generators; Modulation; Multi-stage noise shaping; Noise; Quantization (signal);
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2014 21st IEEE International Conference on
DOI :
10.1109/ICECS.2014.7049928
