Optimal dithered digital sigma-delta modulators for fractional-N frequency synthesizers

By using a structured dither addition it is demonstrated how a very simple 8-bit linear feedback shift register (LFSR) can be used to randomize a digital MASH 1-1-1 SigmaDelta modulator used for fractional-N frequency synthesizers. With this optimization, spur tones for high frequency offset from th...

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Bibliographic Details
Published in2007 18th European Conference on Circuit Theory and Design pp. 563 - 566
Main Authors Gonzalez-Diaz, V.R., Garcia-Andrade, M.A., Flores-Verdad, G.E.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2007
Subjects
Degradation
Delta-sigma modulation
Digital modulation
Frequency modulation
Frequency synthesizers
Multi-stage noise shaping
Noise shaping
Phase noise
Quantization
Topology
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Summary:By using a structured dither addition it is demonstrated how a very simple 8-bit linear feedback shift register (LFSR) can be used to randomize a digital MASH 1-1-1 SigmaDelta modulator used for fractional-N frequency synthesizers. With this optimization, spur tones for high frequency offset from the carrier are avoided without significant area and power budget increase.
ISBN:1424413419
9781424413416
DOI:10.1109/ECCTD.2007.4529658