A Low-Jitter Added Sscg With Seamless Phase Selection And Fast Afc For 3(Rd) Generation Serial-Ata

A low-jitter added 3GHz spread-spectrum clock generator (SSCG) with seanless phase selection and a fast automatic frequency calibration (AFC) was implemented in 90nm CMOS process. The proposed SSCG takes full advantage of mufti-phase switching with increased sigma-delta operation speed. Large frequency shift and low jitter addition is obtained without extra phase management logic. A new AFC is also proposed for multi-band LC-VCO used in the SSCG. A fast and high resolution frequency calibration is done with direct counting of high frequency VCO clock. The experimental result shows that only 2.7ps peak-to-peak jitter is added by spread-spectrum clocking (SSC) and 400ns of unit frequency comparison time is achieved in AFC process.