A 0.77 ps RMS Jitter 6-GHz Spread-Spectrum Clock Generator Using a Compensated Phase-Rotating Technique

NCUIR > College of Electrical Engineering & Computer Science > Department of Electrical Engineering > journal & Dissertation > Item 987654321/52012

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52012

Title:	A 0.77 ps RMS Jitter 6-GHz Spread-Spectrum Clock Generator Using a Compensated Phase-Rotating Technique
Authors:	Cheng,KH;Hung,CL;Chang,CH
Contributors:	電機工程學系
Keywords:	LOCKED LOOP;SERIAL-ATA;LOW-POWER;MODULATION;VCO;CALIBRATION;TECHNOLOGY;CONVERTER;DIVIDERS;NOISE
Date:	2011
Issue Date:	2012-03-28 10:13:16 (UTC+8)
Publisher:	國立中央大學
Abstract:	This study demonstrates a 6-GHz triangular-modulated spread-spectrum clock generator (SSCG) based on a fractional-N PLL in a 90-nm CMOS process. This paper presents a phase-rotating technique to create the fractional-N topology for the SSCG and implement spread-spectrum clocking (SSC) by modulating the fractional-N ratios. The proposed phase-rotating technique consists of virtual multiphase generation and the phase compensation approach. This technique effectively compensates the instantaneous timing error and shows the ignorable quantization error. Unlike the delta-sigma technique commonly used for SSCGs, the proposed SSCG realizes non-dithered fractional division ratios. In terms of SSC, this approach suppresses the RMS jitter to less than 1 ps, showing a significant improvement in the jitter performance in this work. The measured power attenuation of electromagnetic interference (EMI) is 16.12 dB, with a deviation of less than 0.5% (5000 ppm). Operating at a 6-GHz clock rate, the measured RMS jitter with and without the down-spreading spectrum are 0.77 and 0.71 ps, respectively. The chip core area is less than 0.55 x 0.45 mm(2) and the core power consumption is 27.7 mWat a supply of 1.0 V.
Relation:	IEEE JOURNAL OF SOLID-STATE CIRCUITS
Appears in Collections:	[Department of Electrical Engineering] journal & Dissertation

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