一种高性能低功耗直接数字频率合成器的设计  

A Design of High-Performance Low-Power Direct Digital Frequency Synthesizers

作　　者：木霄易[1] 刘丽蓓[1] 邵丙铣[1] 

机构地区：[1]复旦大学国家微电子材料与元器件微分析中心,上海200433

出　　处：《微电子学与计算机》2007年第1期45-48,51,共5页Microelectronics & Computer

摘　　要：文章基于分段线性近似算法提出分段泰勒二阶近似算法,从频谱纯度分析了该算法的优越性,讨论了系数位数和分段数的选取,最后结合硬件优化的系统结构,设计实现了SFDR达102.3dB的数字频率合成器。综合结果表明,该算法实现的系统面积上要比分段线性近似算法的系统小20%,功耗上也小39.5%。与现有的其他数字频率合成器比较表明,在设计高频谱性能DDFS方面,其在功耗和面积上都具有较大优势。This paper presents new techniques to implement direct digital frequency synthesizers（DDFS）with pieeewise 2nd-order-Taylor-series approximation based on piecewise-linear approximation. The algorithm＇s performance is analyzed in spectral purity. Selections of finite length coefficients and number of segments are discussed. Finally, a 102.3dB-SFDR direct digital frequency synthesizer is implemented with optiniized circuit architecture. Synthesis results show that, the proposed DDFS circuits is 20% less than piecewise-linear approximation in area, and 39.5% lower in power. In high spectral performance design, the method proposed in this paper is superior in area and power compared with previously proposed approach.

关 键 词：直接数字频率合成器 分段泰勒二阶近似 低功耗 

分 类 号：TN4[电子电信—微电子学与固体电子学]