| Since the development of the electronic information industry,a series of applications such as optical fiber communication,digital communication,and satellite communication have been realized using electronic technology and information technology.At the same time,the complexity of various electronic systems has grown rapidly.In the research and development stage,we need to find,locate and resolve subtle problems in the system.As one of the most commonly used signal observation tools,an oscilloscope can directly collect and display or calculate the signals in the system under test,and users can discover abnormal signals in the electronic system in time.Digital oscilloscopes with a high sampling rate,a high waveform capture rate,and a display effect that is easy to observe with the naked eye have undoubtedly become a necessity in the field of electronic design or testing today.In order to adapt to this requirement,while developing a high sampling rate oscilloscope,how to improve the waveform capture rate and design a display effect that is easy to observe have also become research priorities.The extremely fast data processing speed and fewer processing procedures can improve the system efficiency,which also improves the waveform capture rate.The display effect needs to start from the waveform display mode in different use occasions,and study the characteristics of abnormal signals in the electronic system.Based on the 40 GSPS oscilloscope platform,this article divides the signal into three dimensions of amplitude,time and the distribution of amplitude with time.Taking the three-dimensional mapping system in the digital oscilloscope as the research theme,the above three Posi information is presented to improve For the purpose of waveform capture rate and improvement of the display effect of three-dimensional waveforms(three-dimensional: amplitude,time,and amplitude distribution with time),the following research is carried out on the three-dimensional mapping system of 40 GSPS oscilloscope in combination with actual use:1.Three-dimensional mapping system based on alternate transmission and processing,multi-channel parallel processing and pipeline technology.For data collected by 8 ADCs,data preparation for multi-channel parallel mapping is realized.In the process of multi-channel parallel mapping,to control the synchronization between the key states of the multi-channel state machine,it is also necessary to increase the state for vector mapping to vector connect the data between each mapping area.Control the alternate reception,transmission and processing of sampled data.Eventually,the two sets of data are alternately and parallelly three-dimensional mapped,and combined with the pipeline processing method,the mapping efficiency is greatly improved,and the waveform capture rate is improved,and the highest can reach no less than 1,000,000 wfms / s.2.Three-dimensional waveform monochrome and cross-color display and grayscale adjustment methods based on RGB color space.Combined with the grayscale adjustment in the monochrome system,to overcome the shortcomings that the probability information of the three-dimensional waveform in the monochrome system is not prominent and lacks a sense of hierarchy,this paper has studied two cross-color system solutions.The four parts are used for the display of four channels.The waveform range of each channel spans a small color range,but there is no intersection between the color ranges;the other display color is to use the entire color space for four channel displays at the same time.Through gray scale adjustment,waveforms with different probability information are highlighted under different gray scale conditions.Due to the inconsistency of the time or mapping efficiency required to acquire the waveform at different time base gears,this paper studies to modify the probability values under different time base gears to achieve the same display effect when switching the time base gears.3.Three-dimensional waveform display method based on dual time base and scanning refresh.In the three-dimensional mapping mode,in order to facilitate the observation of the waveform details,the dual time base mode under the three-dimensional mapping is also designed,also known as the window mode.In any time base gear,the normally displayed three-dimensional waveform can be amplified at any multiple within the constraint range,making it easy to observe the "subtle" signal that appears in the signal.At the same time,in the slow time base file,the time to acquire a whole waveform is too long and exceeds the screen refresh time.Therefore,the three-dimensional mapping mode under the slow time base gear,called the three-dimensional map in SCAN mode,is designed to solve The contradiction between the acquisition time and the refresh time makes the oscilloscope have a better three-dimensional waveform display effect in the slow speed range.The display effect becomes that the waveform scrolls and refreshes from the right side of the screen to the left side,which can be at the slowest 20s/div's Three-dimensional waveforms are refreshed in real time in the base position.Relying on the 40 GSPS oscilloscope platform,a three-dimensional mapping system containing all the above-mentioned functions is designed.A series of operations and technologies such as parallel processing,pipeline,ping-pong alternation,cross-color system conversion,dual time base processing,and scanning refresh are used to realize the acquisition of data and maping to 3D database in real time and display on the screen. |
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