The Design And Implementation Of High-Speed Acquisition And Testing Technique In Mixed Signal Oscilloscopes

Mixed Signal Oscilloscope (MSO) is a revolutionary oscilloscope, which combines the function of digital oscilloscope and logic analyzer.It not only has a variety of trigger modes and strong ability to capture signals and reproduct waveforms, but also supplies logic and waveform analysis functions. It features the comprehensive analysis of complex signals in qualitative and quantitative aspect, making it an indispensable test toolin modern high-speed system design.As part of the project of a certain type of MSO, this thesis mainly includes the research and implementation of the acquisition and reconstruction forhigh-speed signalsas well as the waveform test functions.Firstly, it introduces the development and technical characteristics of MSO, and sketches the system overall framework according to the function and indicators to be achieved in this project.Secondly, it analyzes the design of high-speed acquisition and data reconstruction.After describing the function of data acquisition system, the thesis presents the plan of the acquisition control flowand the design of time base. Besides, measures are taken to eliminatethe adverse effect caused by parallel storage. Based upon in-depth discussion on thedesign methodsof random sampling and sine interpolation module, this thesis implements the reconstruction for ultra-high-speed signal.Thirdly, the design process of waveform test module is introduced, which is based on the digital phosphor technique. After explaining the mathematical model and implementation flow of digital phosphor process, the process of waveform mapping and imaging models are discussed.The framework is optimized to enhance the waveform capture rate and display performance. In addition, the design of waveform mask test module is studied in detail, along with a brief description of the histogram function.Finally, every functional unit is implemented and verified. At last, this thesis presents the summarization of work done and proposes some suggestions for improvement.