DDS phase-locked swept source and study design

This paper presents a DDS-based PLL frequency synthesizer design. Using DDS + PLL frequency synthesis, which has high frequency of the DDS resolution and high frequency accuracy, it is easy to implement phase-locked loop process control and other advantages. In order to achieve the required broadband sweep function and the corresponding technical indicators, the features of it have a good combination of narrow-band tracking filter system. This paper analyzes the DDS source of the designed phase-locked sub-sweep case and designs the appropriate hardware and software circuit.