Title :
Reduced Complexity MASH Delta–Sigma Modulator
Author :
Ye, Zhipeng ; Kennedy, Michael Peter
Author_Institution :
IEEE, Shanghai
Abstract :
A reduced complexity digital multi-stage noise shaping (MASH) delta-sigma modulator for fractional-N frequency synthesizer applications is proposed. A long word is used for the first modulator in a MASH structure; the sequence length is maximized by setting the least significant bit of the input to ldquo1;rdquo shorter words are used in subsequent stages. Experimental results confirm simulations.
Keywords :
circuit complexity; circuit noise; delta-sigma modulation; frequency synthesizers; modulators; MASH delta-sigma modulator; fractional-N frequency synthesizer; multistage noise shaping; reduced complexity modulator; Delta modulation; Frequency conversion; Frequency modulation; Frequency synthesizers; Hardware; Multi-stage noise shaping; Noise shaping; Phase modulation; Pulse modulation; Quantization; Complexity; delta–sigma modulator; multi-stage noise shaping (MASH); noise shaping; sequence length;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2007.896940
