直接数字通过多种方法可以实现调频信号的合成。本文介绍了一种新的直接数字合成法。该方法利用加法器,对寻址结构中的调频信号实施两级相加,然后通过数字转换器与低通滤波器,完成调频信号的直接数字合成。在仿真结果的验证下,该方法在实际运用中是可行的。使用该技术在合成调频信号时,比其他方法的硬件电路图更加简单,而且具有很高的频率稳定度,另外这种技术的频率具有偏移大的优势。 Direct digital through a variety of methods can be achieved FM signal synthesis. This article describes a new direct digital synthesis method. The method uses an adder to add two levels of the FM signal in the addressing structure and then performs the digital synthesis of the FM signal through a digital converter and a low-pass filter. Under the verification of simulation results, this method is feasible in practice. Use of the technology in the synthesis of FM signals than other methods of hardware circuit diagram is simpler, and has a high frequency stability, the frequency of this technology has the advantage of large offset.