Design and Implementation of A Signal Generator By Using Direct Digital Synthesis Technique

A PIC microcontroller is a main processor to generatefour types of waveforms. This device has two channelsoutput which not only provides user’s editablewaveform (sine, square, triangular, sawtooth etc) butalso indicates user’s frequency. The waveformsynthesis is based on the Direct Digital Synthesis(DDS) technique to provide high stability andaccuracy. The synthesized digital values at the port ofthe microcontroller are converted to an analogwaveform by an 8-bit DAC. This signal generator cangenerate Sine, Square, Triangle and Sawtoothwaveforms. It can operate standalone or with apersonal computer (PC). A dot-matrix LCD is used todisplay the information about the waveform and thefrequency selection. The type of waveform and thefrequency selection can be selected from the embeddedkeypad or PC. The waveform table can be uploadedfrom the PC to the generator. The generator stores thereceived waveform table in the FLASH memory anduses it to generate waveform