Digital Synthesis Signal Source

The new general signal source, represented by arbitrary wave generator, is widely used in the mordern testing field. Given the abilities of generating all kinds of ideal and none ideal signals, it has been widlely used in the domains of communication, radar, navigation, etc.This paper focuses on the generating of the arbitrary wave, discusses the principles of DDS(Direct Digital Synthesis)which are used in the generation of the wave, analyzes the key techniques in the research and presents solutions of arbitrary wave generator,. The system structures of hardware and software are presented, the performance indexes are discussed and the possibility of the system is considered. Finally, with respect to the problems in debugging and testing process, analyzing is done in some degree and the practical solutions are presented.The signal generator is based on DOS (Direct Digital Synthesize), the maximal frequency of signal is 5MHz, the minimal frequency is 0. 148Hz, its minimal resolution is 0. 148Hz. most digital logic is accomplished in CPLD (complex programmable logic device) ; the control and calculating is finished in computer, and the external hardware is communicated with computer by EPP of it; the software is programmed in the developing plat of Labwindows/CVI.