Design and Implementation of a Signal Generator Based on DDS

In this article, the principle of Direct Digital Frequency Synthesis is introduced and a method for designing a signal generator based on DDS chip of AD9850, using a singlechip to control it and aided by indispensable peripheral circuits is proposed to form a signal generator that out signal tranquilization and high precision. The signal generator can generate sine wave, square wave and triangular wave, of which amplitude and frequency can be adjusted. Experiment results indicate that the hardware is simple,the stability of out put signal frequency is better than 10 -3 and amplitude error is under 5%.