Arbitrary Waveform Based On The Cf Card

A recently developed technique of Direct Digital Synthesis (DDS) changed the waveform generation method from analog to digital. There are two kinds of DDS: Direct Digital Frequency Synthesis (DDFS) and Direct Digital Waveform Synthesis (DDWS). DDWS can provide precise signal phase and powerful frequency resolving capability, meanwhile it can produce sorts of complex wave in a more convenient way and improve the spectrum purity. The most important is that DDWS can Pre-distort the amplitude and phase, which makes the output signal more closely approach the idea one. The waveform generated with DDWS is of strict coherence, repetitiveness, high stability and programmability.The DDWS can also easily realize the waveform parameter agility and generate arbitrary waveforms in order to meet the urgent needs for anti-interference and strong viabilities of radars under modern EW environment. Thus, further researches on DDWS are of much importance.This dissertation introduces the work principles, hardware circuit structure and application of a high-speed arbitrary waveform generator based on DDWS. In this system, the data transmit rate is up to 800Mbit/s and the cache is constituted with 10 chips of SDRAMs which have 128Mbit capacity per chip. The system is based on IF sampling and can generate various waveforms of different pluswidth and bandwidth.The primary work in this dissertation:1. Compare the differences and similarities between direct digital waveform synthesizer(DDWS) and direct digital frequency synthesizer (DDFS).2. Point out the advantages of the SOPC. Introduce the primary characteristics of the SOPC based on Nios II and the feasibility of the system implementing based on Nios II.3. A high-speed arbitrary waveform generator base on DDWS method and use the CF card as waveform storage device.4. Debug the system including the application program, CF card driver program and controller; test the result of the system.