基于现场可编程门阵列的数控振荡器设计

Design of numerical control oscillator based on field programmable gate array

基于现场可编程门阵列,设计出精度为8位的数控震荡器。选取XC3S200AN芯片,使用查找表设计方法,在存储正、余弦数字波形时,利用正、余弦信号的对称性,采取存储1/4周期波形的方法,以减少硬件存储资源的使用。通过泰勒修正算法对信号输出进行优化,以提高杂散抑制性。使用ISE14.7和MATLAB 2015b软件,对所设计的数控震荡器及其输出数字正、余弦信号进行频谱分析和仿真,结果表明设计方案可行。

Based on field programmalbe gate array （FPGA ）, a numerical control oscillator is designed, whoes output precision can reach 8 b its . The XC3S200A chip is selected, and the look-up table design method is used. According to the symmetry of sine and cosine signals, only 1/4 period digital waveform are stored to reduce the use of hardware storage resources. Besides, the Taylor correction algorithm is used to optimize the signal output in order to improve spurious suppression. With the help of software ISE14. 7 and Matlab 2015b , simulation on the designed oscillator and spectrum analysis on its output digital sine and cosine signals show that, the design scheme is feasible.