FPGA circuit design of frequency modulation signal generator
Direct digital frequency synthesizer (DDS) technology, with fast frequency switching speed, easy to improve frequency resolution, low hardware requirements, programmable all digital easy monolithic integration, is conducive to reduce costs, improve reliability and easy to produce and other advantages. At present, each major chip manufacturer has successively introduced the high performance and multifunctional DDS chip produced by advanced CMOS technology. The special DDS chip adopts a specific process, with small internal digital signal jitter and high output signal quality. In some cases, however, because of the special DDS chip control mode is fixed, therefore in the way of working, frequency control and system requirements of a big gap, at this moment if use high performance FPGA device design meets the needs of their DDS circuit is a very good solution, it can be heavy configuration structure can achieve the function of various complex modulation, has good practicability and flexibility.