Optimized Simulation Design of DDS Signal Generator Based on FPGA

Nowadays, most function signal generators use DDS (Direct Digital Synthesis) technology, and the design of function signal generators is based on the principle of DDS technology. The traditional method is to use DDS special chip, single chip microcomputer or analog circuit, which is widely used but has defects. Aiming at the single function of special DDS chip, this paper proposes a design scheme of DDS signal generator based on FPGA (Field Programmable Gate Array). Based on the basic principle of signal frequency modulation, the theory is deduced, combined with the basic working principle of DDS technology, and the DDS frequency modulation signal is generated by FPGA. The simulation results show that the system design is accurate and meets the functional requirements. The design theory and circuit in this paper are correct and feasible, which shows that the frequency modulation of analog signal can be realized by digital method on FPGA. This design scheme is more stable and practical than that of analog circuit design.