FPGA Implementation of High Speed and High Precision Direct Digital Frequency Synthesizer Based on Parallel_CORDIC
QI Yan-ji · Dianzi xuebao · 2014
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.