The Design And Realize Of DDS Based On FPGA

Arbitrary Waveform Generator(AWG)is one of the most popular instruments in modern testing domains,which represents the developing direction of signal sources.Direct Digital frequency Synthesis(DDS)advanced early in 1970s is a full digital technology for frequency synthesis,its LUT method for synthesizing waveform adapts to generate arbitrary waveform.Field Programmable Gate Array(FPGA)has the features of large scale integration,high working frequency and can realize large memory,so FPGA can effectively realize DDS.The EP2C35F672C6 of Corporation Altera is chosen to do the main digital processing work,which is based on its large scale and high speed.The S3C2440 MCU is chosen as a control chip.In this design,how to design the FPGA chip and the interface between the FPGA and the control chip is the problem.With the method of software and hardware programming,the design used the software QuartusⅡand language verilog-HDL solves it successfully.In this paper,the principle of DDS and basis of EDA technology is introduced firstly.The problems met in the design are analyzed and the whole function is partitioned into three parts:master chip,FPGA device and peripheral hardware.The three parts are described in detail independently.The disadvantage and things need to advance are also listed.At the end of the dissertation,the measurement result of the system is given and its error is analyzed.It is shown the AWG can output a sine wave,a triangle wave,a sawteeth wave,or a square wave within the frequency range from 0.01Hz to 20MHz with the step of 10mHz,or output an arbitrary waveform within the range from 0.01Hz to 20kHz.Through an experiment,it is testified that the design meets the requirement planed and the way to use software and hardware programming method and DDS technology to realize Functional Waveform Generator is available.