Design and Implementation of a Digital Function Signals Generator using FPGA

Abstract: In this paper, the direct digital frequency synthesizer (DDS) specifications were improved by increasing the number of accumulator bits, increasing the memory capacity of the generated signal samples, using a DAC by increasing the number of its bits, as well as generating different types of analogue signals in a digital way. In this paper also, we discuss a practical mechanism of a digital function signals generator (DFSG) based on a direct digital frequency synthesizer (DDFS) using Cyclone II EP2C20F484C7 FPGA from ALTERA placed on education and development board DE-1 with the following parameters: -Output waveforms: Sin, Gaussian, Sinc, Square , Saw tooth ,Triangular, and Wight Noise Signals. -Frequency range:  (3Hz…..10000 KHz  ). -Frequency Resolution  (3Hz). -Signal amplitude  (5V). -With Reset the generator. -Frequency of the generated signal for all types (1MHz).

Keywords:  DFGS, DDFS , FPGA, DPNG , SIN, SINC ,SQUARE, SAWTOOTH, GAUSSIAN, TRIANGULAR  .