Title :
A Spur-Free MASH DDSM With High-Order Filtered Dither
Author :
Fitzgibbon, Brian ; Pamarti, Sudhakar ; Kennedy, Michael Peter
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. Coll. Cork, Cork, Ireland
Abstract :
A novel dithered multistage noise shaping (MASH) digital delta-sigma modulator (DDSM) that produces a spur-free output spectrum is presented. The order of the least significant bit (LSB) dither shaping can be increased to that of the modulator, without producing spurious tones. Theoretical results prove that the quantization noise is asymptotically white and uncorrelated with the input; this is corroborated by behavioral simulations.
Keywords :
circuit noise; delta-sigma modulation; filtering theory; modulators; quantisation (signal); LSB dither shaping; digital delta-sigma modulator; dithered multistage noise shaping; high-order filtered dither; least significant bit dither shaping; quantization noise; spur-free MASH DDSM; spur-free output spectrum; Delta-sigma modulation; Frequency synthesizers; Modulation; Multi-stage noise shaping; Noise; Quantization; Transfer functions; Digital delta–sigma modulator (DDSM); dither techniques; multistage noise shaping (MASH); quantization;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2011.2161172
