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实现了一种改进的CORDIC算法,其迭代方向由输入角二进制表示时的各位位值直接确定,避免了CORDIC基本算法中迭代方向需由剩余角度计算结果决定的不足,提高了CORDIC算法的运行速度,并且基于这种改进的CORDIC算法和并行流水结构,完成了一种高速直接数字频率合成(DDS)数字核心电路设计.该电路在Jazz公司0.35μm工艺(ri35sy101库)条件下达到1 GHz的工作频率,具有参数灵活可调特征,可作为IP应用于AD9858和AD9910等高端DDS芯片.
An improved CORDIC algorithm is implemented. The iterative direction is directly determined by the bit values of the binary representation of the input angle, which avoids the disadvantages that the iterative direction in the CORDIC basic algorithm needs to be determined by the remaining angle calculation results, and improves the running speed of the CORDIC algorithm , And based on this improved CORDIC algorithm and parallel pipeline architecture, a high-speed direct digital frequency synthesis (DDS) digital core circuit design was completed that achieves 1 GHz at Jazz’s 0.35μm process (ri35sy101 library) Frequency, flexible and adjustable parameters, and can be used as IP in high-end DDS chips such as the AD9858 and AD9910.