Direct digital frequency synthesizer design based on FPGA
Zhu Yaofu · Applied science and technology · 2010
To make a signal amplitude and frequency continuously adjustable in a certain range, this paper introduces the structure and principles of DDS (Direct Digital Frequency Synthesizer) for the design of signal generator with frequency stepping less than 1Hz. Also a detailed design method of DDS realization based on FPGA and corresponding EDA software QuartusⅡ is given. It can adjust the frequency and amplitude of a waveform by changing the parameters, and generate arbitrary waveform by changing the waveform data in the ROM lookup table. Designing DDS by making use of FPGA greatly simplifies the design process of electric circuit, shortens the debugging time, and makes it convenient for modification and adding of DDS.