基于FPGA的FM信号发生器设计与实现

摘要：为提高FM信号发生器的频率准确度和稳定度，并使其相关技术参数可调，设计了一种基于FPGA和直接数字频率合成（DDS）技术的产生方法。系统以labwindows/cvi为上位机开发环境，实现FM信号调制参数的可调，并通过PCIE接口将上位机设置的FM信号控制字和波形数据传给FPGA，FPGA内部通过控制DDS核来实现FM信号的产生。测试结果表明，FM信号的频率精度高且稳定性好,最高输出载波频率达40MHz,幅度精度能达到5mV。该FM信号发生器在软件无线电、雷达目标特征识别和雷达距离探测等领域具有很高的应用价值和广阔的应用空间。

Design and Implementation of FM wave generator base on FPGA

Abstract: In order to improve the frequency accuracy and stability of the FM signal generator, and make it relevant technical parameters adjustable, a method is designed based on FPGA and Direct Digital Synthesizerl(DDS) technology. The system can achieve adjustable FM signal modulation parameters by the labwindows on PC , and through the PCIE interface FM signal control word and waveform data is transferred to the FPGA, FPGA control the integrated DDS core to achieve the FM signal generation. Test results show that the frequency of FM signal have high frequency accuracy and stability ol, the maximum output of the carrier frequency can reach 40MHz, and the amplitude accuracy can reach 5mV. The FM signal generator have a broad application space in software radio, radar target feature identification and radar detection distance and other fields.