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- Title
一种改进超四算法的DDS 设计.
- Authors
汤衡; 何善亮; 陈杨
- Abstract
In order to improve the performance of direct digital synthesizer(DDS),the phase-to-space converter for DDS is improved. Based on the coordinate rotation digital computer algorithm(CORDIC),the properties of the angle approximation of the trigonometric function and the conversion relationship between the phase addressing bit and the rotation angle are used to improve the Excessfours algorithm. An improved algorithm with only one unidirectional rotation is obtained,and the circuit structure realized by the algorithm is given. Through Matlab simulation analysis,the spurious free dynamic range(SFDR) value of the circuit can reach -119. 1 dBc,and the output error is less than 1.05伊10-5. Simulation experiments based on Xilinx FPGA platform show that the output delay of the circuit structure does not exceed 21 ns,which is nearly 48% faster than that of other types of CORDIC algorithms,and the area resources are also significantly reduced. This design can provide new ideas for system optimization such as radar and communication.
- Subjects
COMPUTER algorithms; MATHEMATICAL optimization; DELAY lines; ROTATIONAL motion; ALGORITHMS; TRIGONOMETRIC functions
- Publication
Telecommunication Engineering, 2020, Vol 60, Issue 3, p344
- ISSN
1001-893X
- Publication type
Article
- DOI
10.3969/j.issn.1001-893x.2020.03.018