The Hardware Design Of Wireless Smart Virtual Oscilloscope

Electronic industry is changing and developing rapidly with each passing day,which promotes innovation of electronic measure equipments.The metabolic electronic industry has made more requirements directing at measure equipment.In the field of measure equipment,improving performance index is prime trend.However,increasingly complex measure conditions and gradually particular objects have proposed some new requirements for functional diversity of measure equipments.This paper has implemented some research aiming to expand functions of digital storage oscilloscope.This system presented in this paper based on the structure of acquisition module in digital storage oscilloscope brings in wireless data interaction and architecture of virtual instrument.Because of ascendant performance in respect of graphic processing and data operation smartphones are utilized in this system to display waveform,realize man-machine interaction and process data.Eventually user experience of man-machine interaction has been consummated.Meantime signal acquisition has been separated from man-machine interaction.Portability of system has been realized,which make this system apply to work under complex and dangerous circumstance.This paper based on the project of wireless smart virtual oscilloscope includes the following content:1.Miniaturization and low-cost design of system has been introduced.Parts selection,application circuit design and place and route of PCB(print circuit board)have centred on miniaturization and low-cost requirement.Balance between design requirement and high performance of system has been took consideration.Design cost has been handled reasonably.2.Low-power consumption design has been implemented.First,work states of system have been divided.Then different modules in this system have been supplied power or switched off according to different working condition.Low-power strategy directing at FPGA and ADC have been draw up,which has decreased ineffective power consumption furthest and ascended device efficiency.3.Modular design method has been brought in this system,which based on the concept of virtual instrument has been realized through module division and makes the system flexible.Design cost has been decreased and reusability of hardware has been improved through switching modules.Function characteristics and performance index also can be changed according to the different modules combination.4.The method of data interaction between acquisition module and wireless module has been designed and realized.The customized bus timing has been proposed aimming at low-bitrate problem and occasional transmission error.The finite state machine has been utilized to realize I/O state switch of bus to overcome communication glitch.According to experiment,it is drawn that the wireless smart virtual oscilloscope has the sample rate up to 250 MSPS,100MHz analog bandwidth and 3.4MB/s wireless communication.The function of triggering including edge mode,pulse width mode and digital mode has been realized.This system can complete three hours of continuous work under the power supply from battery.The content of this paper can be as a reference for design of portable instrument.