Analysis and Prediction of Spurs in a Fractional-N Frequency Synthesizer with Discontinuous Nonlinearity

Valerio Mazzaro, Luke Gleeson, Michael Peter Kennedy
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引用次数: 1

Abstract

The output phase noise of fractional-N frequency synthesizers shows spurious tones due to nonlinearities present in the system. Recently, Donnelly and Kennedy have provided a numerical method to predict the locations and amplitudes of the spurs. This has been tested and confirmed for charge pump (CP) PLLs with different types of continuous nonlinearities. This paper applies the method to cases where the nonlinearity is discontinuous. This type of nonlinearity can be considered as being representative of digital PLLs with quantization in the loop.
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具有不连续非线性的分数n频率合成器中杂散的分析与预测
由于系统中存在非线性,分数n频率合成器的输出相位噪声显示出杂音。最近,Donnelly和Kennedy提供了一种数值方法来预测马刺的位置和振幅。对不同类型连续非线性的电荷泵锁相环进行了实验验证。本文将该方法应用于非线性不连续的情况。这种类型的非线性可以被认为是具有量化环的数字锁相环的代表。
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