Development of FPGA for Custom Waveform Generator Based on Direct Digital Synthesizer

In this paper an efficient approach is present to design custom waveform generator based on DDS with low phase noise and high switching speed for military communication applications. It can generate custom signals with different modulations whose amplitude, frequency or phase are controlled by the description words given from an external computer. DDS is a frequency synthesizer which can generate arbitrary waveforms from a single, fixed frequency reference clock. In order to implement such custom waveform generator along with DDS we need FPGA. FPGA are used to realize DDS to meet different demand of the user such as high switching speeds. Then, the AD9858 used as the DDS core with compression ROM is compiled using Xilinx XC2V250 FPGA by VHDL language. The performances such as integration, expansibility are very much improved. We need design a Graphical User Interface (GUI), which allows simple control of the hardware.