The Design Of Digital Oscilloscope Based On ARM

In recent years, with the rapid development of society, the requirements for technology in a lot of professional fields are rising quickly. As one of the most important technology in the information technology industry, signal measurement technology has become a very bright star, and as one of the most important branch of the signal measurement technology, the oscilloscope is no longer limited to the application of the professional category, but extending to various fields of social livelihood extensively.The main content of this article is the design of digital oscilloscope based on ARM. After compared with various schemes, the final choice is the structure of FPGA and ARM, the structure mainly includes signal modulation, signal acquisition, data collection, system control and display and so on, the character of this is easy to realize the measurement of signal waveform, and easy to take with low power consumption. This article is mainly research on every module, and design the hardware platform of the oscilloscope with portable and low power consumption. The system is process the signal to attenuation, follow, amplification and acquisition, achieving the switch of DC and AC coupling and so on. FPGA processes the date and transfer them to ARM. ARM reads the data and displays its waveform and parameter with touch function of liquid crystal screen.Firstly, the paper explained the background of the subject and the development of oscilloscope. secondly analyzed the oscilloscope performance concretely, including the maximum sampling rate, storage depth and so on; and then specific discussed the design of hardware circuit, include passive attenuation circuit, DC/AC coupling circuit, a relay drive circuit, impedance transformation circuit, programmable gain amplifier circuit, DAC circuit, adder circuit, ADC signal collection circuit, trigger circuit, crystal oscillator circuit, power control circuit, liquid crystal display and a touch control circuit and other modules, and also gives the schematic of each module, then introduced the software design of the system. Finally, the digital oscilloscope is tested, and the problems in testing and test results are analyzed.