【摘要】 本文提出了一种直接数字频率合成器(DDFS)的设计,以Parallel_CORDIC(COrdinate Rotation Digital Computer)算法模块替代传统的查找表方式,实现了相位与幅度的一一对应,输出相位完全正交的正余弦波形;同时应用旋转角度预测及4:2的进位保存加法器(CSA)技术,将速度比传统CORDIC算法提高41.7%,精度提高到10-4.最后以Xilinx的FPGA硬件实现整个设计.更多还原

【Abstract】 The design of a direct digital frequency synthesizer( DDFS) is proposed in this paper. Parallel-CORDIC( Cordinate Rotation Digital Computer) algorithm module is used to replace the traditional look-up table method,the phase and amplitude of a one-to-one correspondence is realized,and outputs are sine and cosine waveforms that completely orthogonal in phase. The angle prediction and 4: 2 Carry Save Adder( CSA) technologies are also applied in the design,the calculation speed is 41. 7% faster than the traditional CORDIC algorithm and the accuracy is improved to 10- 4. Finally,the whole design is implemented based on Xilinx FPGA development board.更多还原