Abstract:

The multifunctional signal source choose the AD9850 chip as the core of multifunctional signal source frequencysynthetic,use 89C52 to control the DDS AD9850 and data processing.The system can realize much functions,The functions include that outputting sine single and square wave and other conventional waveformas well as AM,FM,ASK,FSK,PSK modulation.with keyboard and display part,Realize  inputting of parameter and display of information,constituted a complete frequency synthesizer,The design realizes arbitrary frequency output from 10 Hz to 40 MHz,step value can be adjusted.After the final test of the system,and the experimental data shows that,the system has good stability,high accuracy,wide range.

Key words: multifunctional signal source;DDS;89c52;AD9850