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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Guanghua Shu Woo-Seok Choi Saxena, S. Anand, T. Elshazly, A. Hanumolu, P.K. |
| Copyright Year | 2014 |
| Description | Author affiliation: Univ. of Illinois, Urbana, IL, USA (Guanghua Shu; Woo-Seok Choi; Saxena, S.; Anand, T.; Hanumolu, P.K.) || Intel, Hillsboro, OR, USA (Elshazly, A.) |
| Abstract | Continuous-rate clock-and-data recovery (CDR) circuits with automatic frequency acquisition offer flexibility in both optical and electrical communication networks, and minimize cost with a single-chip multi-standard solution. The two major challenges in the design of such a CDR are: (a) extracting the bit-rate from the incoming random data stream, and (b) designing a wide-tuning-range low-noise oscillator. Among all available frequency detectors (FDs), the stochastic divider-based approach has the widest frequency acquisition range and is well suited for sub-rate CDRs [1]. However, its accuracy strongly depends on input transition density (0 ≤ ρ ≤ 1), with any deviation of ρ from 0.5 (50% transition density) causing $2×(ρ-0.5)×10^{6}$ ppm of frequency error. In this paper, we present an automatic frequency-acquisition scheme that has unlimited range and is immune to variations in transition density. Implemented using a conventional bang-bang phase detector (BBPD), it requires minimum additional hardware and is applicable to sub-rate CDRs as well. Instead of using multiple LC oscillators that are carefully designed to cover a wide frequency range [2,3], a ring-oscillator-based fractional-N PLL is used as a digitally controlled oscillator (DCO) to achieve both wide range and low noise, and to decouple the tradeoff between jitter transfer (JTRAN) bandwidth and ring-oscillator-noise suppression. |
| Starting Page | 150 |
| Ending Page | 151 |
| File Size | 540672 |
| Page Count | 2 |
| File Format | |
| ISBN | 9781479909186 |
| ISSN | 01936530 |
| e-ISBN | 9781479909209 |
| DOI | 10.1109/ISSCC.2014.6757377 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2014-02-09 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Phase locked loops Jitter Oscillators Frequency locked loops Frequency measurement Bandwidth Clocks |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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