摘要:介绍了利用直接数字合成技术产生频率扫描信

号的新方法。利用计数器和相位累加器实现对波形存

储器寻址, 从而产生频率扫描信号序列。该序列通过

数-模转换器和低通滤波器后, 产生出频率扫描信号。

被合成的频率扫描信号的起始频率、 终止频率和扫描

时间可根据需要随意设定,并且可以实现对三者的精

确控制。-Abstract: The use of direct digital synthesis techniques to create a new method of frequency sweep signal. The use of counters and phase accumulator to achieve the waveform memory addressing, resulting in a frequency sweep signal sequence. The sequence through the number- analog converter and low pass filter, to produce a frequency sweep signal. Was synthesized frequency sweep signal the start frequency, stop frequency and sweep time can be arbitrarily set according to need, and can achieve precise control of the three.