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

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题名:	A 0.77 ps RMS Jitter 6-GHz Spread-Spectrum Clock Generator Using a Compensated Phase-Rotating Technique
作者:	Cheng,KH;Hung,CL;Chang,CH
贡献者:	電機工程學系
关键词:	LOCKED LOOP;SERIAL-ATA;LOW-POWER;MODULATION;VCO;CALIBRATION;TECHNOLOGY;CONVERTER;DIVIDERS;NOISE
日期:	2011
上传时间:	2012-03-28 10:13:16 (UTC+8)
出版者:	國立中央大學
摘要:	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.
關聯:	IEEE JOURNAL OF SOLID-STATE CIRCUITS
显示于类别:	[電機工程學系] 期刊論文

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