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Folded Noise Prediction in Nonlinear Fractional-N Frequency Synthesizers.
- Source :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers; Oct2021, Vol. 68 Issue 10, p4038-4048, 11p
- Publication Year :
- 2021
-
Abstract
- The presence of nonlinearities in a fractional-N frequency synthesizer leads to the generation of an additional component of noise that appears in the output phase noise spectrum. This nonlinearity-induced noise component manifests itself as spurious tones and an elevated noise floor, also known as folded noise. This paper presents a mathematical analysis of the folded noise generated in fractional-N phase locked loops (PLL) by the interaction between the quantization noise introduced by the divider controller and a nonlinearity. The analysis is performed for different digital $\Delta \Sigma $ modulators (DDSM) and nonlinearities, providing expressions that allow one to predict the folded noise. These are compared with state-of-the-art predictions and simulation results. [ABSTRACT FROM AUTHOR]
- Subjects :
- FREQUENCY synthesizers
PHASE-locked loops
NOISE
PHASE noise
MATHEMATICAL analysis
Subjects
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 68
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 153763161
- Full Text :
- https://doi.org/10.1109/TCSI.2021.3104275