基于FPGA的DDS调频信号发生器设计与实现

模拟调制系统中,总结起来有两种调频方法,直接调频法可以获得较大频率偏移,但频率稳定低,温漂时漂都比较大,间接调频法频率稳定高,但是电路十分复杂。针对上述传统模拟调频方法的不足,从信号调频基本原理出发进行理论推导,结合DDS技术基本工作原理进行设计,利用FPGA来实现DDS调频信号的产生。并着重介绍了DDS调频原理及电路实现过程,给出了FPGA设计的仿真和示波器测试图,整个电路硬件单元简单,稳定性好,实验结果表明该设计是有效的。

Design and Implementation of DDS Modulation Signal Generator Based on FPGA

In the analog modulation system,there are two kinds of frequency modulation method to sum up.The direct frequency modulation method can obtain large frequency offset,but frequency stability is low,temperature drift and time drift are relatively large;indirect frequency modulation method for frequency stability is high,but the circuit is very complex.Aiming at the lack of traditional analog frequency modulation method,theoretical derivation is made from the basic principle of signal frequency modulation,combinating the basic work principle of DDS technology to design,using FPGA to achieve the generated DDS FM signal.It focuses on the DDS modulation principle and circuit realization process.provides simulation and oscilloscope test chart FPGA designis.The whole hardware circuit unit is simple,the stability is good,the experimental results show that the design is effective.