Design equations and baseband model for double-sampling phase-locked loop

Abstract

As in the case of many other important mixed-signal circuits, the mathematical model of the double-sampling phase-locked loop (PLL) results in an integro-difference equation which cannot be solved easily. Nonuniform and nonideal sampling makes the design problem even more complicated. In this paper, a baseband model and design equations are derived for the double-sampling PLL. The new model proposed here takes into account the effect of nonideal sampling and generates all signals both in the discrete- and continuous-time domains. The theoretical results are verified by measurements. The advantage of the proposed model is that it improves the accuracy and reliability of the circuit design process.

Publication Title

Proceedings of the IEEE International Conference on Electronics, Circuits, and Systems

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