DDS是直接数字式频率合成器（Direct Digital Synthesizer）的英文缩写，是一项关键的数字化技术。与传统的频率合成器相比，DDS具有低成本、低功耗、高分辨率和快速转换时间等优点，广泛使用在电信与电子仪器领域，是实现设备全数字化的一个关键技术。文件写了一个DDS的例程，并编写了TB文件。-DDS is a direct digital synthesizer (Direct Digital Synthesizer) of the English abbreviation, is a key digital technology. Compared with the traditional frequency synthesizer, DDS has the advantages of low cost, low power consumption, high resolution and fast conversion time. It is widely used in the field of telecommunication and electronic instrument, which is a key technology to realize the whole digitization of equipment. The file was written with a DDS routine and a TB file was written.