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Design of Multi-Mode Frequency Synthesizer for System Level Clocking精品.pdf

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Design of Multi-Mode Frequency Synthesizer for System Level Clocking精品

Available online at Available online at Procedia Engineering Procedia Engineering 00 (2011) 000–000 Procedia Engineering 29 (2012) 866 – 873 /locate/procedia 2012 International Workshop on Information and Electronics Engineering (IWIEE) Design of Multi-Mode Frequency Synthesizer for System Level Clocking Yuan Lina*, Xiang Lulub aDepartment of Physics, Shaoyang University, Shaoyang 422004, Hunan,China bDepartment of Electronics and Communication, Shenzhen Institute of Technology, Shenzhen 518000, Guangdong, China Abstract This paper describes the design of a multi-mode frequency synthesizer. The oscillation frequency of VCO is 5GHz, and the reference clock accepts 18-39MHz. A multi-mode controller which contains triangular wave generator, 3rd order Sigma-Delta modulator, programmable divider, etc, is proposed in this paper. The measurements show a less than 58dB spur, the spectrum spread about 4700ppm and the EMI is reduced about 22dB. This circuit consumes 28mW power at 1.2V power supply and is manufactured in 0.13um CMOS process. © 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Harbin University of Science and Technology Open access under CC BY-NC-ND license. Keywords: multi-mode frequency synthesizer; spread spectrum clock; SSC; LC-VCO; fractional-N 1. Introduction In recent system d