Observations and Analysis of Wandering Spurs in MASH-Based Fractional-N Frequency Synthesizers

被引：11
|
作者：
Mai, Dawei [1 ]
Mo, Hongjia [2 ]
Kennedy, Michael Peter [1 ]
机构：
[1] Univ Coll Dublin, Sch Elect & Elect Engn, Dublin 4, Ireland
[2] Hisense, Shanghai 266071, Peoples R China
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2018年 / 65卷 / 05期
基金：
爱尔兰科学基金会;
关键词：
Digital delta-sigma modulator (DDSM); multi-stage noise shaping (MASH); spurious tones; quantization;
D O I：
10.1109/TCSII.2018.2821636
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Fractional-N frequency synthesizers can exhibit a phenomenon known as wandering spurs. This brief traces the root cause of the phenomenon to the divider controller. Predictions of the repeat period and the wander rate in the case of a multi-stage noise shaping delta-sigma modulator (MASH DDSM)-based divider controller are given. Simulations, based on CppSim simulations of a type-II CP-PLL with a third-order digital delta-sigma based divider controller, confirm the theoretical predictions.
引用
收藏
页码：662 / 666
页数：5
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