现代电子技术2017，Vol.40Issue(19)：10-13,4.DOI:10.16652/j.issn.1004-373x.2017.19.003
高性能直接数字式低频率合成器设计
Design of high-performance direct digital low-frequency synthesizer
李建伟1
作者信息
- 1. 长治学院 电子信息与物理系,山西 长治 046000
- 折叠
摘要
Abstract
The current method used to design the high-performance direct digital low-frequency synthesizer is difficult to calculate the address width of the lookup table of the direct digital low-frequency synthesizer,which has low resolution of output frequency and high phase noise. Therefore,a design method of high-performance direct digital low-frequency synthesizer based on FPGA is proposed. The principle of the direct digital low-frequency synthesizer is analyzed to obtain the sine wave formula of the synthesizer. On this basis,the method combining the carry chain with pipelining technology is used to calculate the width of input address of the lookup table to get the data length range satisfying lookup table. The phase accumulator is combined to out-put the digital sawtooth wave to get some phases of digital sawtooth as the input addresses of ROM,and then the table lookup and calculation are carried out for the input addresses to accomplish the design of the high-performance direct digital low-fre-quency synthesizer. The experimental results show that the method can improve the frequency resolution of the direct digital fre-quency low-frequency synthesizer effectively,and has strong ability to resist phase noise.关键词
频率转换/低频率合成器/锯齿波/查找表Key words
frequency conversion/low-frequency synthesizer/sawtooth wave/lookup table分类
信息技术与安全科学引用本文复制引用
李建伟..高性能直接数字式低频率合成器设计[J].现代电子技术,2017,40(19):10-13,4.
