Study Of Multi-Channel Arbitrary Waveform Generator Based On ARM Technique

With the development of the technique of computer and microelectronics, a new measure instrument--Arbitrary Waveform Generator (AWG) comes into being. AWG can generate many kinds of standard and arbitrary waveform signals. It has good future with its precision, stabilization, repeatability and facility.The intention of this paper is to design a new-style AWG that based on ARM (Advanced RISC Machines) embedded system and Direct Digital Synthesis (DDS) technique. DDS is the key technique. DDS is an advanced technique on frequency synthesis. Its primary advantages are controlling facility, continuous phase and fine frequency resolution. It is an important field of the AWG design. This paper introduces in detail the composition, the working principle and the properties of DDS, analyses the reason of DDS phase noise, and gives the method of reducing the noise.Realization of DDS depends on the digital devices of high speed and high performance. In this paper, the ARM embedded system based on S3C44B0X is selected to realize DDS. The Samsung ARM7 microprocessor chip S3C44B0X was developed using a 16/32-bit ARM7TDMI RISC processor core designed by Advanced RISC Machines, Ltd. Its high-speed, low-power, multifunctional, cost effective, simple and elegant design is particularly suitable for the central controller chip of instruments.This paper attempts to use the advanced embedded system, deeply researches how to design the AWG based on ARM embedded system and DDS technique from the view of project application. The author has researched and developed an AWG with the technique of DDS. The circuit framework, designing method, detailed software flow chart and program of arbitrary waveform editor are given in this paper. The result of experimentation proves that this AWG has attained the desire of design.Finally, the main research contents of full text are summarized, main research conclusions and innovation points are given, and the insufficiency of this paper and research emphases in the future are pointed out.