Design And Realization Of DDS Based On VHDL

Frequency synthesis technology is critical electronic systems technology, radar, communications, weapons guidance, electricity in the fight have a wide range of applications. They require a very wide frequency range with high speed, providing a large number of high-precision, high stability of the frequency signals. DDS technology is a departure from the concept phase of the waveform required for the direct synthesis of a new all-digital frequency synthesis technology. Application of all-digital large-scale integration technology, small size, low price and high frequency resolution(0.01Hz), fast changing frequency(<20nS), ease of intelligent control, programmable and flexibility such prominent features of large. It is different from other frequency synthesis methods of superior performance and characteristics of the modern synthesizer technology leader. DDS is widely used in acceptance of the oscillator, signal generator, instrumentation, communications systems, radar systems, especially suitable for FM radio communication systems. DDS emerging technology portfolio and its relationship with phase-locked frequency synthesis technology will be the new trend, we now have foreign countries attach great importance to the frequency synthesis technology research, high-resolution, wide operating frequency, low phase noise, high frequency of Agile rate Synthesis family of products are emerging. Thesis and design of a hardware description language VHDL-based direct digital frequency synthesizer. Through MAX+Plus II software development platform, will be composed of a variety of chip board-level product integration for chip-level products, thereby reducing power consumption, improve reliability, but also the design can be easily modified online, is a The new kinds of digital circuit design methods. Work process, first of all are familiar with VHDL and direct digital frequency synthesizer works, on this basis, through the design entry, compilation, verification and configuration of the prototype DDS generated, and the peripheral circuits have been designed.The designed software is downloaded to ALTERA produced FLEX10K series EPF10K30TC144 chip. And MAX+PLUS II development environment for the conduct of the simulation analysis. The main outcome of papers and innovation are as follows:1) Design and implementation which is based on EDA technology, direct digital frequency synthesizer. Fully reflects the Hardware Description Language (VHDL) of the overall design idea, making the system operational speed, safety and reliability have been fully protected.2) Use MAX + PLUS II software platform, its simulator powerful simulation function, can be designed to continuously revise and improve the program, thereby enhancing the efficiency of the design and shorten the design cycle, to ensure the accuracy of the overall system design.3) Software design uses a "top-down" design ideas, through the modular design makes the design process simple, highlighting the functions of each module.4) Hardware emulation links verified the correct design to ensure system reliability and security.The design is complete direct digital frequency synthesizer system is the software simulation and hardware testing, to achieve the desired design requirements, with a good application value. Digital Frequency Synthesizer for further research to lay a certain foundation.