测井技术2013，Vol.37Issue(1)：75-79,5.
基于DDS和DSM的多通道信号源的设计与实现
Design and Implementation of DDS and DSM-based Multi-channel Signal Sources
摘要
Abstract
Introduced is DDS and DSM-based multi-channel high-precision sine and cosine signal generator architecture. The FPGA direct digital frequency synthesis (DDS) technology is used to generate high quality multiple channel signal sources, which at the sametime effectively reduces the hardware resources consumption. The architecture includes TDM-based CORDIC sine and cosine waves generator, 1 bit Delta Sigma modulator (DSM) DAC and analog low-pass filter. To realize 14 bit precision, the CORDIC uses 16 stages of pipelined design, so the SNR is about 80 dB. The 5th-order 1 bit DSM is used to implement 1 bit DAC so as to ensure the final output signal precision. When the output frequency is 200 kHz, the measured SNR is 78. 6 dB, which meets the requirement of spectrum purity of the four-channel signal sources. The above design is particularly suitable for high-precision multi-channel sine and cosine signal source in the low frequency domain,and effectively simplifies the design of multi-channel signal while reducing the costs.关键词
直接数字频率合成/多通道信号源/旋转坐标数字计算机/Delta Sigma调制器Key words
DDS/ multi-channel signal source/ CORDIC/ Delta Sigma modulator分类
天文与地球科学引用本文复制引用
陈洋,管国云,聂在平..基于DDS和DSM的多通道信号源的设计与实现[J].测井技术,2013,37(1):75-79,5.基金项目
国家自然科学基金项目 No.60931004资助 （）
