DocumentCode :
1576918
Title :
A small area fully integrated spread-spectrum clock generator with high EMI-reduction for SATA-3.0 applications
Author :
Li, Zhen-Yu ; Chiueh, Herming ; Juang, Ying-Zong ; Chiu, Chin-Fong
Author_Institution :
Inst. of Commun. Eng., Nat. Chiao-Tung Univ., Hsinchu, Taiwan
fYear :
2010
Firstpage :
672
Lastpage :
675
Abstract :
In this paper, a small area spread-spectrum clock generator (SSCG) with high EMI reduction for SATA-3.0 is presented. Conventional methods use inductor-capacitance (LC) tank to fulfill the high frequency requirement for SATA-3.0. However, the monolithic inductors always occupy a large area, and required precisely characteristic for different fabrication processes. This research propose a SSCG using a ring voltage-controlled oscillators (Ring-VCO) at 6GHz operating frequency; By using the proposed Ring-VCO, the active area of SSCG is 65% of comparable LC tank implementations, and Ring-VCO is much easier to characterized for any CMOS process. In addition, a multi-stage-noise-shaping (MASH) delta-sigma modulator (ΔΣ modulator) is used to reduce fractional spurs and quantization error for high EMI reduction. The chip is designed in TSMC 0.18um 1P6M CMOS process with active area of 500um×300um, and the simulation results consumes 60.43mW with 1.8V supply. The peak-to-peak jitter at 6GHz output of non spread-spectrum is 6.16ps, and the EMI reduction is 22.49dB with 5000ppm down spread to 5.97GHz.
Keywords :
CMOS integrated circuits; delta-sigma modulation; electromagnetic interference; inductors; pulse generators; voltage-controlled oscillators; ΔΣ modulator; CMOS process; EMI-reduction; MASH delta-sigma modulator; Ring-VCO; SATA-3.0 application; SSCG; fractional spur; frequency 6 GHz; monolithic inductor; multistage-noise-shaping; peak-to-peak jitter; power 60.43 mW; quantization error; ring voltage-controlled oscillator; size 0.18 micron; spread-spectrum clock generator; voltage 1.8 V; CMOS process; Clocks; Delta modulation; Electromagnetic interference; Fabrication; Frequency; Inductors; Multi-stage noise shaping; Spread spectrum communication; Voltage-controlled oscillators;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems (MWSCAS), 2010 53rd IEEE International Midwest Symposium on
Conference_Location :
Seattle, WA
ISSN :
1548-3746
Print_ISBN :
978-1-4244-7771-5
Type :
conf
DOI :
10.1109/MWSCAS.2010.5548915
Filename :
5548915
Link To Document :
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