Hadware Design And Implemention Of High Speed And High Precision Virtual Oscilloscope

With the rapid development of electronic application technology,computer bus technology and analog-to-digital converters,the combination of computer software technology and electronic instruments has created a new concept of computer instrument system—virtual instrument.Virtual instrument is an automated and humanized test and measurement instrument system that can be changed on demand.In order to make full use of the computer’s powerful data calculation,analysis and processing capabilities and the acquisition and test measurement capabilities of hardware instruments,virtual instruments can combine various computer resources with various instruments built by hardware through computer software development technology,making it through Different software modules can obtain different instrument functions.Users can easily complete the development and design of system instruments according to existing computer resources and current test requirements,and use the data acquisition card built by hardware and the host computer software developed by computer software to collect,detect,process,analyze and display signals.And other functions.The virtual oscilloscope evolved based on the idea of virtual instrument is mainly used by the hardware acquisition system to complete the signal acquisition,processing analysis and output,and the computer peripheral hardware cooperates with the operation.The emergence of the virtual oscilloscope architecture idea broke the design and structure of the traditional instrument,and replaced the hardware circuit with computer software technology.The data analysis,signal processing,spectrum analysis,signal display and other functions of the traditional oscilloscope realized by hardware were replaced by computers.Complete,improve work efficiency and reduce research and development time.Based on this,this article focuses on the system design,hardware design and debugging analysis of the virtual oscilloscope to complete the overall development of the virtual oscilloscope.First,it analyzes the basic principles of traditional oscilloscopes,including the basic elements of analog oscilloscopes and digital oscilloscopes,and the structure and structure of virtual oscilloscopes as well as the advantages presented by traditional oscilloscopes.The development process of virtual oscilloscopes is determined,and the structure and composition of virtual oscilloscopes are analyzed.Determine the overall system design plan,and carry out the main chip selection and the design requirements of the entire hardware system PCB.On the basis of the above research,the focus is on the development of the data acquisition system in the entire hardware of the virtual oscilloscope,including the signal conditioning circuit processed by the analog front end,analog-to-digital conversion circuit,high-frequency clock generation circuit,PCIE interface circuit and FPGA logic control design,etc.and completed the hardware circuit design and implementation.Finally,the construction of the system test environment was carried out,and the actual system test was carried out.The content included the test of the sampling rate,resolution and bandwidth of the system with the help of matlab software in the early stage,and the joint test of the host computer and the hardware acquisition system in the later stage.The test data shows that the maximum sampling rate of the virtual oscilloscope is3 Gsps,the maximum resolution is 12 bits,and the analog bandwidth is 2.5 GHz,and the data acquisition system has been applied to related medical test equipment.