Design And Implementation Of Digital Systems Based On The Dds Function Generator

The general signal source, represented by function generator, is wildly used in the modern testing field. Given the abilities of generating all kinds of wave signals, such as sine wave, triangle wave, square wave and so on. Therefore, it has been widely used in the domains of communication, radar, navigation, etc.This article focuses on the generating of the function waves which include sine wave, triangle wave and square wave, depict the concepts of DDS(Direct Digital Synthesis) and surveying frequency on equal precision, analyze the key techniques in the development and present solutions of function generator. Author also present the system structures of hardware and software, discuss the performance indexes and consider the possibility of the system. Finally, with respect to the problems in debugging and testing process, author do some analyzing and present the practical solutions.The main attributions of the paper include:1. Demonstrate the working process of function generator and the functions of its circuits, and depict the working principles of three waves.2. With a view to the theory of DDS, this paper introduces the realization of DDS, which based on programmable device. It also discusses in detail some key techniques such as the design of high speed phase accumulator and RAM.3. With a view to the theory of surveying frequency on equal precision, introduces the realization of surveying frequency.4. Introduces the function of monitor software in function generator, and describe the realization of different modules.