计算机工程与科学2009，Vol.31Issue(12)：121-123,3.DOI:10.3969/j.issn.1007-130X.2009.12.036
频率合成器中Σ-Δ调制器的设计与实现
Design and Implementation of a Sigma-Delta Modulator in the Frequency Synthesizer
摘要
Abstract
The principle of the sigma-delta modulation technology is introduced first in this paper. Then the first-order and the higher order sigma-delta modulators are analyzed, and finally a method for the sigma-delta modulator based on FPGA is proposed. This design of a sigma-delta modulator is correct and feasible. Simulation results show that the results from the sigma-delta modulator and the fractional-N divider by controling the frequency divider implemented by this method are well in accordance with the simulation results based on Matlab software. Then noise shaping characteristics of the higher-order sigma-delta modulator is further experimentally verified. The fractional spur introduced by the fractional-N frequency synthesizer can be suppressed by the loop filter of the phase-locked-loop,which is highly practicable.关键词
频率合成器/Σ-Δ调制器/现场可编程门阵列Key words
frequency synthesizer/sigma-delta modulator/FPGA分类
信息技术与安全科学引用本文复制引用
刘德建..频率合成器中Σ-Δ调制器的设计与实现[J].计算机工程与科学,2009,31(12):121-123,3.基金项目
国家自然科学基金资助项目(60472091) （60472091）
教育部新世纪优秀人才支持计划资助项目(NCET-05-0754) （NCET-05-0754）
广西自然科学基金资助项目(桂科自0447093,0640168) （桂科自0447093,0640168）
