Design and implementation of linear frequency modulated waveform using DDS and FPGA

In this paper a simple method of design and implementation of a LFM (linear frequency modulation) waveform or chirp of 3μsec pulse duration with 200MHz bandwidth, using DDS (direct digital synthesis) and FPGA [Virtex4 LX25FF668 (-10)] is explained. The design and implementation of LFM consists of, 1) Design and realization of spot frequency generation using DDS [AD9858]. 2) Design and realization of LFM waveform using DDS for higher bandwidth.