摘要
在研究数控振荡器NCO工作原理的基础上,通过分析对比几种不同的NCO设计方法,采用了算法简单、节省资源的基于ROM查找表的设计方法。针对正交数控振荡器NCO的主要部件正余弦存储表、可变模计数器进行了算法设计和电路设计,并在Altera公司的FPGA上进行了验证,波形仿真结果表明了电路设计的正确性。采用查找表的方法可以有效提高系统功能的可扩展性和系统的可集成性,使得NCO功能模块可以通过配置存储表、频率控制字来满足多种应用场合下的NCO设计需要,可以广泛地应用于各种现代通信系统中。
This paper introduces the working principle of NCO, through analysis and comparison of several different NCO design method,uses a kind of simple and save resources based on ROM look-up table design method. According to orthogonal NCO main part is sine and cosine storage table and the variable mode counter, algorithm and circuit design are presented,and the test and waveform simulation results in Altera company＇s FPGA show the correctness of the circuit design. Using the lookup table method can effectively improve the system function scalability and system integration, makes the NCO function module can through the configuration storage table, frequency control word to meet many application situation＇s NCO design needs, can widely used in all kinds of modem communication system.
出处
《电子设计工程》
2011年第17期149-152,共4页
Electronic Design Engineering
关键词
软件无线电
数控振荡器
现场可编程门阵列
直接数字频率合成
software radio
Numerical Control Oscillator（NCO）
Field Programmable Gata Array（FPGA）
Direct Digital Synthesis （DDS）
