Modeling and implementation of a frequency sweeping signal generator based on FPGA and DAC

In this paper, a frequency sweeping signal generator based on FPGA and DAC was described. The signal generator used FPGA and Verilog to design direct digital synthesizer and then realize linear sweeping signal waveform. Several parameters can be adjusted in the software, such as frequency tuning word, delta frequency tuning word, delta frequency ramp rate word, the signal generator will generate linear sweeping waveform. Detailed design of FPGA is presented. Meanwhile, relevant experiments are given, and the experimental result shows that this signal generator can improve the frequency resolution of the direct digital frequency synthesizer effectively and has very good spectral characteristics.