| Logic Analyzer is one basic tool of Data Domain Measure. It is a kind of instrument with wide application in research, teaching and manufacture. Virtual instrumentation technique is developed upon both instrument technique and computer technique. This technique is considered as the future trend of instrument technology. This thesis focuses on the research and development of the Logic Analyzer(LA) based Virtual Instrument (VI) technology. The first part of the thesis has a review-like character. It makes a brief introduction of the logic analyzer technique, which including logic analyzer's concept, main function. The thesis also introduces the virtual instrument's concept, system architecture, etc. The development of virtual instrument's application software is discussed in detail. It includes Virtual Instrument Software Architecture (VISA), and Virtual Instrument's software platforms.The thesis mainly discusses the design of Logic Analyzer, based on logic analyzer technique. The principle of Logic Analyzer is addressed. After requirement analysis being surveyed, the system framework is presented. The instrument is made up of two parts: application software on personal computer, and the data-sampling system based hardware circuit board. The hardware circuit board is designed and discussed in detail, its firmware design is also described. The thesis actualizes many kinds of trigger type of the instrument, simulates them in CPLD. All prove that the design is satisfied with the requirement. The layout of the application software on personal computer is put forward, including designing the main function, driver, RS-232 interface and communication protocol.In the end of the thesis, a summary is presented and some suggestions are forward to improve the instrument.
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