Functional Waveform Generator Based On DDS

Direct Digital frequency Synthesis (DDS) was advanced rapidly in early 1970s and has been developing owing to its entirely digital structure. The appearance of Field Programmable Gates Array has changed the design method of digital electronical system and provided a new design model. With the two technologies and the flexible control ability of MCU, Functional Waveform Generator, has been developed. This new signal source can generate high frequency waveform data and also can change parameters of the Functional Waveform Generator. This paper will describe its process and characteristics.The EP1C6Q240C8 of Corporation Altera is chosen to do the main digital processing work, which is based on its large scale and high speed. The AT89C51 MCU of Corporation ATMEL 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 Quartus II and language verilog-HDL solves it successfully.In this paper, the principle of DDS and basis of EDA technology is introduced firstly. Then the master chips are introduced. They are the base of the design. 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. Finally the function, performance, realization, and experiment results are introduced in detail through some experiments. The disadvantage and things need to advance are also listed.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.