Name
Title | ||
|---|---|---|
Combined Effects of Frequency Quantization and Additive Input Noise in a First-order Digital PLL |
Abstract | ||
|---|---|---|
A recent work by Gardner [Gardner, F.M., Frequency granularity in digital phase-locked loops, IEEE Trans. Commun., 44 (1996), 749758] on the subject of digital phase-locked loops (DPLLs) investigated, via simulation, the characteristics of the phase-jitter caused by frequency quantization in the numerically-controlled oscillator. Further works by Feely, Teplinsky et al [Feely, O., Rogers, A., and Teplinsky, A., Phase-jitter dynamics of digital phaselocked loops, IEEE Trans. Circuits and Systems, Part I: Fundamental Theory and Applications, 46 (1999), 545-558], [Feely, O., and Teplinsky, A., Phase-jitter dynamics of digital phase-locked loops: Part II, IEEE Trans. Circuits and Systems, Part I: Fundamental Theory and Applications., 47 (2000), 458-473] used the theory of nonlinear dynamics to provide a complete analytical explanation of this phase-jitter. This paper examines in detail the case where the input signal is embedded in additive noise, a scenario earlier investigated by Gardner where no satisfactory method of characterising the phase-jitter was found. Here, further numerical results for the 1-D DPLL are presented and it is shown analytically how the DPLL noise-jitter dynamics may be approximated by a noisy circle rotation map for reasonable levels of additive noise. The noise in this case is unique and highly nonlinear in nature and thus not amenable to traditional analysis. By considering the the probability flow over time, a time-dependent difference-delay equation is derived for the probability density function (PDF) of the phase-jitter. It is shown that this PDF reaches a steady-state and that this state is described by a non-local equation. The solutions of this equation are investigated, both numerically and analytically, and used to explain the interaction between the additive and quantization noise that was previously not understood. |
Year | DOI | Venue |
|---|---|---|
2009 | 10.1016/j.entcs.2008.12.079 | Electr. Notes Theor. Comput. Sci. |
Keywords | Field | DocType |
first-order digital pll,fundamental theory,phase jitter,additive input noise,nonlinear dynamics,digital phase-locked loop,combined effects,frequency quantization,part ii,phase-jitter dynamic,non-local equation,phase-locked loops,digital phaselocked loop,additive noise,ieee trans,quantization noise,time-dependent difference-delay equation,phase lock loop,oscillations,phase locked loops,probability density function,first order,steady state | Discrete mathematics,Phase-locked loop,Applied mathematics,Oscillation,Nonlinear system,Control theory,DPLL algorithm,Granularity,Electronic circuit,Quantization (signal processing),Probability density function,Mathematics | Journal |
Volume | ISSN | Citations |
225, | Electronic Notes in Theoretical Computer Science | 0 |
PageRank | References | Authors |
0.34 | 1 | 2 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Cillian Ó Tuama | 1 | 0 | 0.68 |
| James P. Gleeson | 2 | 124 | 13.47 |