Based On The FPGA Waveform Synthesis And Design

Due to the rapid advances in electronics technology today,in some areas of the signal generation continues to improve,a single signal synthesis has been unable to be satisfied with people.To this end,people begin to focus on some of the more complex signal generation,in order to meet different areas of demand.Firstly,the principle of traditional frequency synthesizer and direct digital frequency synthesizer(DDS)are described,and their advantages and disadvantages are analyzed briefly.The working characteristics of DDS and the analysis of spectrum are summarized,Non-ideal case of stray characteristics were analyzed in depth.Secondly,with the rapid development of field programmable gate array(FPGA),people pay more and more attention to its application.Therefore,this paper introduces the development process of FPGA,hardware development environment,hardware description language(mainly VHDL language and Verilog HDL language)and FPGA development process in detail.Based on the deep understanding of direct digital frequency synthesis technology,the basic components of DDS are designed through VHDL hardware description language in this paper,and it produces a variety of signals through DDS technology.The technology can generate four kinds of ordinary signals such as sine wave,sawtooth wave,square wave and triangular wave.In the physical laboratory often meet the Lissajous-Figure.The control signal SPWM wave in the power electronic technology,and AM,FM,PM wave in the analog modulation waveforms.their basic principles and mathematical models are described in detail.The respective modules are designed and implemented by Quartus Ⅱ software,and the individual waveform modules are simulated.Finally,the completion of the various modules are downloaded to the FPGA chip for verification.Finally,the scheme is feasibility by the verification of the waveform synthesis,and the waveforms displayed are similar to those that the corresponding principle produces the waveform in the oscilloscope.