Development of the special source module of VXIbus missile automatic test systems

Direct digital frequency synthesis (DDFS) technique was developed for forming frequency signals. The method was used for the development of special source generator module of some VXIbus missile automatic test systems. The waveform data were generated from the phase accumulator and was turned to an analog wave after passing through a converter. Graphics soft panels were developed to control the instruments and to analyze the data from them. DDFS technique exhibited low phase noise, high frequency resolution and high frequency shifting speed. Some scattered noise contributed by phase truncation effect was the main draw back of the method developed.