Design And Implementation Of The Virtual Oscilloscope

Virtual instrument is a combined product of electronic technology and computertechnology; it is composed by the hardware circuit of data acquisition, computer,application software, and a communication interface mode. The external signalacquisition is completed by the instrument hardware circuit of data acquisition, and thenthe collected data is transmitted via a communication interface to the computer software.At last, the display of the measured signal data and the relevant performance parametersis implemented through software programming. This thesis describes the design ofhardware circuit design and software of a virtual oscilloscope. The virtual oscilloscopeis a typical application of virtual instrument and can be divided into two main parts interms of system construction view: the hardware circuit of data acquisition module andthe computer data processing software. Hardware circuit of instrument in coordinationwith PC software not only virtual oscilloscope be able to achieve the traditionaloscilloscope functions, but also can implement other new functions such as powerspectrum, spectrum analysis, waveform storage function by software. So the virtualoscilloscope has greater practical significance in research, teaching and work. The maindiscussion of virtual oscilloscope are instrument hardware circuit design includingsignal conditioning, analog-to-digital conversion, MCU control circuit, Clock circuit,FPGA control module, USB communication which is called the bridge of connect thecomputer and data acquisition system and the introduction and description of the PCsoftware’s main interface, basic operation and software features dialog.At first, the thesis introduces the virtual instrument technology and developmentstatus at home and abroad, analyzes the significance of the research and indicates thatthe virtual instrument is the development trend of future measurement techniques. Thesecond part describes the traditional oscilloscope and virtual oscilloscope performanceadvantages, working principle works and the comparison between the traditionaloscilloscopes. We can achieve lots of advantages about virtual oscilloscope. The thirdpart describes the overall design of system, the advantages of FPGA technology appliedin virtual oscilloscope design and the introduction of the main chips which are used inthe design.The fourth part mainly describes data acquisition system design ofinstrument including an analog-to-digital converter circuit design and the clock circuitdesign and FPGA chip control design, frequency meter design, and USB communication module design. The fifth part explores PC control panel software design.Part VI is about the test and analysis of whole system, the test results can be expected tomeet the design requirements.The last part is a summary and outlook for design.In the process of designing entire virtual oscilloscope, the author’s main task is toparticipate in the design of high-speed data acquisition system and data transmissionscheme design based on Microcomputer Control, namely the communication programdesign of the host computer software with instrument machine of data acquisition, aswell as the software module design and so on.