Rigorous Stability Criterion for Digital Phase Locked Loops
Rigorous Stability Criterion for Digital Phase Locked Loops
复制标题
数字锁相环的严格稳定性标准
DOI:
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
R. Farrell
中科院分区:
文献类型:
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作者:
B. Daniels;R. Farrell
This paper proposes a rigorous stability criterion
for an arbitrary order digital phase locked loop (DPLL), with a charge pump phase frequency detector (CP-PFD)
component. Stability boundaries for such systems are
determined using piecewise linear methods to model the nonlinear nature of the CP-PFD component block. The model
calculates the control voltage, after a predetermined number of input reference signal sampling periods, to a small initial voltage offset. This paper, in particular, takes an in-depth look at the second order system. The second order stability boundaries, as defined by the proposed technique, are compared to that of existing linear theory stability boundaries, and display a significant improvement. The applicability of the proposed technique to higher order systems, using a numerically iterative solution, is presented. Finally the proposed methodology is used to determine the stability boundary of a third order system and thus the component values for a stable system. Using these component values the response of the DPLL to an initial control voltage offset is simulated using a circuit level simulation.
Index Terms—High Order, Phase Locked Loop, Piecewise
Linear, Stability.