Wandering Spur Suppression in a 4.9-GHz Fractional-N Frequency Synthesizer

被引：2

作者：

Mai, Dawei ^{[1
,2
]}

Donnelly, Yann ^{[3
]}

Kennedy, Michael Peter ^{[1
,2
]}

Tulisi, Stefano ^{[4
]}

Breslin, James ^{[4
]}

Griffin, Patrick ^{[4
]}

Connor, Michael ^{[5
]}

Brookes, Stephen ^{[4
]}

Shelly, Brian ^{[4
]}

Keaveney, Mike ^{[6
]}

机构：

[1] Univ Coll Dublin, Sch Elect & Elect Engn, Dublin D04 V1W8 4, Ireland

[2] Microelect Circuits Ctr Ireland MCCI, Cork T12 R5CP, Ireland

[3] Qualcomm, Cork T23 YY09, Ireland

[4] Analog Devices Inc, Limerick V94 RT99, Ireland

[5] Hanwha Phasor, London EC1N 7RJ, England

[6] Robert Bosch Ireland Ltd, Limerick V94 TRW8, Ireland

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2022年 / 57卷 / 07期

基金：

爱尔兰科学基金会;

关键词：

Multi-stage noise shaping; Delta-sigma modulation; Frequency synthesizers; Spectrogram; Quantization (signal); Synthesizers; Phase noise; Divider controller; fractional-N frequency synthesizers; MASH digital Δ modulator (DDSM); phase noise; phase-locked loops (PLLs); quantization noise; spurious tones;

D O I：

10.1109/JSSC.2022.3163080

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 that use a digital Delta-sigma modulator (DDSM) to control the feedback divider can exhibit spurious tones that move about in the frequency domain; these are known colloquially as ``walking'' or wandering spurs. Building upon a theoretical explanation of the origin of wandering spurs, this article presents two methods to suppress them. It describes a 4.9-GHz 180-nm SiGe BiCMOS charge-pump phase-locked loop (CP-PLL) fractional-N frequency synthesizer platform with a divider controller that can function as: 1) a standard MASH 1-1-1; 2) a MASH 1-1-1 with high-amplitude dither; and 3) a MASH 1-1-1 with a modified third stage. Measurements confirm the effectiveness of the wandering spur suppression strategies.

引用

页码：2011 / 2023

页数：13

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