An Adaptive-Bandwidth Referenceless CDR with Small-area Coarse and Fine Frequency Detectors
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- Title
- An Adaptive-Bandwidth Referenceless CDR with Small-area Coarse and Fine Frequency Detectors
- Authors
- Kwon, HJ; Lim, JH; Kim, B; Sim, JY; Park, HJ
- Date Issued
- 2015-06
- Publisher
- IEEK PUBLICATION CENTER
- Abstract
- Small-area, low-power coarse and fine frequency detectors (FDs) are proposed for an adaptive bandwidth referenceless CDR with a wide range of input data rate. The coarse FD implemented with two flip-flops eliminates harmonic locking as long as the initial frequency of the CDR is lower than the target frequency. The fine FD samples the incoming input data by using half-rate four phase clocks, while the conventional rotational FD samples the full-rate clock signal by the incoming input data. The fine FD uses only a half number of flip-flops compared to the rotational FD by sharing the sampling and retiming circuitry with PLL. The proposed CDR chip in a 65-nm CMOS process satisfies the jitter tolerance specifications of both USB 3.0 and USB 3.1. The proposed CDR works in the range of input data rate; 2 Gb/s similar to 8 Gb/s at 1.2 V, 4 Gb/s similar to 11 Gb/s at 1.5 V. It consumes 26 mW at 5 Gb/s and 1.2 V, and 41 mW at 10 Gb/s and 1.5 V. The measured phase noise was -97.76 dBc/Hz at the 1 MHz frequency offset from the center frequency of 2.5 GHz. The measured rms jitter was 5.0 ps at 5 Gb/s and 4.5 ps at 10 Gb/s.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/36281
- DOI
- 10.5573/JSTS.2015.15.3.404
- ISSN
- 1598-1657
- Article Type
- Article
- Citation
- JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, vol. 15, no. 3, page. 404 - 416, 2015-06
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