基于CORDIC算法的参数可调信号源设计

Signal source of adjustable parameters design based on CORDIC algorithm

直接频率合成技术(DDS)是无线通信中的关键技术,因应用场合及技术指标不同,DDS中的正弦波形产生模块有多种实现方法,本设计采用CORDIC算法计算波形数据,并通过预处理实现全部相位波形数据的即时计算,不占用存储资源,且可通过改变迭代次数来调节精度。所设计的DDS精度、频率、相位可调,在Altera Cyclone2中实现时,时钟频率可达172 MHz,占用1 171 LUTs。

Direct Digital Synthesizer（DDS） is the key technology in wireless communications. Due to different applications and specifications, sine wave of DDS generator module has a variety of implementations. The design uses CORDIC algorithm to calculate the waveform data, uses pretreatment to achieve full phase waveform real-time calculation of data, and doesn＇ t take up storage resources. The precision can be adjusted by changing the number of iterations. The accuracy frequency and phase of the DDS designed in this paper are adjustable. Implemented in A1- tera Cyclone2, the clock frequency is up to 172 MHz, occupying 1 171 LUTs.