Reduced Complexity MASH Delta-Sigma Modulator

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...

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Bibliographic Details
Published inIEEE transactions on circuits and systems. II, Express briefs Vol. 54; no. 8; pp. 725 - 729
Main Authors Zhipeng Ye, Kennedy, M.P.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.08.2007
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Circuits
Complexity
Delta modulation
delta-sigma modulator
Digital
Frequency conversion
Frequency modulation
Frequency synthesizers
Hardware
Modulators
Multi-stage noise shaping
multi-stage noise shaping (MASH)
Noise
Noise shaping
Phase modulation
Pulse modulation
Quantization
sequence length
Simulation
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Summary: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.
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ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2007.896940