A 6-GHZ SPREAD SPECTRUM CLOCK GENERATION WITH EMI REDUCTION OF 30.2 DB FOR SATA-III APPLICATIONS

作者：Alsuraisry Hamed; Cheng Jen Hao; Lin Jian An; Kuo Yen Hong; Tsai Jeng Han^*; Huang Tian Wei

来源：Microwave and Optical Technology Letters, 2017, 59(3): 622-624.

DOI：10.1002/mop.30359

• CMOS
• spread spectrum
• SATA
• VCO
• delta-sigma
• EMI reduction

In this letter, a 6-GHz spread spectrum clock generation for Serial AT Attachment Generation 3 (SAT-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 (sigma) 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).

• 出版日期2017-3