Design and Implementation of a Digital Liner Frequency Modulation (LFM) Synthesizer using FPGA

Abstract: This paper proposes the design and implementation mechanism of digital LFM synthesizer, based on the use of Direct Digital Frequency Synthesizer (DDFS). The proposed synthesizer is achieved using Cyclone II EP2C20F484C7 FPGA, placed on education and development board DE-1.
Using DDFS techniques in radar domain allows implementing different digital modulation operations (pulse, LFM, BPSK according to Barker codes, coherent and etc) with high accuracy and high speed in digital signal synthesizing. The designs can be developed and modified according to user requirements due to the use of reprogrammable chips (FPGA).

Keywords: Digital Modulator LFM , DDFS, FPGA.