介绍了利用Altera公司的FPGA 器件 (cyclone) 产生线性调频信号的DDS工作原理、设计方案、电路结构。并详细讨论了利用FPGA 器件实现DDS技术时, 采取的一些改进优化措施-Introduced the use of Altera' s FPGA device (cyclone) generate a linear FM signal DDS working principle, design, circuit configuration. And discussed i