A 200-Mbps/spl sim/2-Gbps continuous-rate clock-and-data-recovery circuit |
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Authors: | Rong-Jyi Yang Kuan-Hua Chao Shen-Iuan Liu |
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Affiliation: | Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan; |
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Abstract: | A 200-Mbps/spl sim/2-Gbps continuous-rate clock-and-data-recovery (CDR) circuit using half-rate clocking is presented. To detect the data with wide-range bit rates, a frequency tracing circuit (FTC) is used to aid the frequency acquisition. A wide-range and low gain voltage-controlled oscillator (VCO) is also presented by using analog and digital controlled mechanisms. A two-level bang-bang phase detector is utilized to improve the jitter performance and speed up the locking process. This CDR circuit has been realized in a 2P4M 0.35-/spl mu/m CMOS process. The experimental results show that this CDR circuit with the proposed FTC can receive 2/sup 31/-1 pseudorandom bit stream when the bit rate ranges from 200 Mbps to 2 Gbps without the harmonic-locking issue. All measured bit error rates are below 10/sup -12/. The measured root-mean-square and peak-to-peak jitters are 5.86 ps and 41.8 ps, respectively, at 2 Gbps. |
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