Design Of Waveform Recording And DPX Modules Based On Segment Storage Technology

Nowadays,electronic information engineering technology is developing swiftly,and the digital signal frequency is also increasing.Capturing infrequent events in high-speed signals has become a major challenge for digital oscilloscopes,which requires the digital oscilloscope to have a large storage depth while maintaining a high sampling rate,in order to increase the probability of capturing abnormal signals.This article mainly studies the implementation and application of segment storage technology on DPO.On the basis of building a data acquisition and storagesystembased on segment storage technology,combined with the advantages of segment storage and DPX,it will improve the ability to caputure abnormal events in high-speed signals.The specific research goals of this paper mainly include:1.Build a 20 GSPS data acquisition system based on time-sampling technology,and design a segment storage scheme for waveform data.This solution can realize real-time storage of 20 GSPS sampling rate data,and the maximum storage depth of a single channel can reach 1Gpts;realize segment storage function,according to different time base gears and storage depth settings,up to 65536 waveforms that meet the same trigger conditions can be stored Into the memory,and can realize the hardware to read each waveform.2.Design of the three-dimensional mapping function based on segment storage and the afterglow display function of the three-dimensional mapping waveform.Two mapping schemes of single frame acquisition,single frame mapping and segmented storage centralized mapping are designed.The former mapping method implements three-dimensional mapping under variable storage depth,and the latter maps multiple waveforms stored in large-capacity memory segmentally.The segment readout is sent to the 3D database for waveform superposition and display.And the use of hardware logic to achieve the afterglow display function of the three-dimensional mapped waveform,according to user needs can set the retention time of the waveform data in the threedimensional database,which can control the retention time of the waveform on the screen,to achieve the variable afterglow display effect of digital oscilloscope It is easier to capture infrequent or intermittent signals in the waveform.3.Waveform recording and playback function design based on segment storage.Introduce a pause mechanism in the segment storage process,so that the oscilloscope can maintain a high screen refresh frequency during segment storage,and can be paused at any time according to user settings,set the read parameters to read and playback the specified waveform.The design of this paper realizes the segment storage in the 20 GSPS data acquisition system,and the waveform recording and playback based on the segmented storage and the three-dimensional mapping function improve the efficiency of the oscilloscope to store the waveform in a large capacity,while greatly retaining the details of the waveform.