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A 6‐GHz spread spectrum clock generation with EMI reduction of 30.2 dB for SATA‐III applications
Author(s) -
Alsuraisry Hamed,
Cheng JenHao,
Lin JianAn,
Kuo YenHong,
Tsai JengHan,
Huang TianWei
Publication year - 2017
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.30359
Subject(s) - emi , electrical engineering , chip , frequency divider , microwave , cmos , voltage controlled oscillator , engineering , bandwidth (computing) , delta sigma modulation , electronic engineering , frequency multiplier , voltage , electromagnetic interference , physics , telecommunications
In this letter, a 6‐GHz spread spectrum clock generation for Serial AT Attachment Generation 3 (SATA—III) applications in 0.18‐pm CMOS technology is presented. The 3rd‐order loop filter is to reduce the ripple of control voltage of VCO and the loop bandwidth is 625 KHz. With the aid of second‐order delta‐sigma (ΔΣ) modulator and triangular profile counter, the division ratio of divider chain can be changed periodically. The modulation frequency is 37.04 KHz with upper bound of 19 for the triangular profile counter. The proposed circuit spreads 30‐MHz frequency range from 5.97 to 6.0 GHz with an EMI reduction of 20.3 dB. The dc power consumption is 34 mW with a chip size of 0.54 mm 2 . © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:622–624, 2017