On the statistical properties of phase noise in Fractional-N frequency synthesizers using successive requantizers
Abstract
The noise-shaping quantizer is commonly used in Fractional-N Frequency Synthesizers to provide a control signal to the feedback divider with a fractional mean component and high-pass spectral properties. The Digital Delta-Sigma Modulator (DΔΣM) is typically used to carry out this function. Unfortunately, divide ratio modulation is a significant component of the PLL phase noise, in particular due to interactions between modulation-induced phase noise and nonlinear loop dynamics. A recently proposed modulator, named the Successive Requantizer, claims to offer better spurious component and phase noise performance compared to the traditional DΔΣM, while offering similar noise-shaping properties. This paper describes a method of deriving the statistical properties of both the modulated control signal and the corresponding phase noise, for given state transition matrices. Convergence of the noise PMF is also described.
Publication Title
2016 IEEE International Conference on Electronics, Circuits and Systems, ICECS 2016
Recommended Citation
Donnelly, Y., & Kennedy, M. (2017). On the statistical properties of phase noise in Fractional-N frequency synthesizers using successive requantizers. 2016 IEEE International Conference on Electronics, Circuits and Systems, ICECS 2016, 448-451. https://doi.org/10.1109/ICECS.2016.7841235
