A system for realizing average acquisition of oscilloscope by fpga segmented memory

Abstract

The invention relates to the technology of utilizing FPGA sectional storage to realize oscilloscope average collection, comprising an ADC sampling module, a frame data processing module, a sectional storage and average module, and a data output module, wherein the average process of the sectional storage and average module is: SUM_AVEm=SUM_AVEm-1+DATA_NEW-DATA_OLD, wherein USUM_AVEm is an average data sum, SUM_AVEm-1 is a last average sum, DATA_NEW is latest frame processing data, and DATA_OLD is the initial frame processing data of a set average frequency; the DATA_NEW and the DATA_OLD are both stored in an FPGA internal storage area; frame data is stored in a DATA_NEW unit, is sent to an adder-subtractor, and meanwhile is written into an external storage area by a read-write control module. The technology has excellent display effects, reduces CPU costs, and guarantees speeds.

Description

technical field [0001] The invention relates to a digital oscilloscope, which is a way for the oscilloscope to realize average acquisition, and is suitable for general low-cost deep storage oscilloscopes. Background technique [0002] Digital oscilloscope is a common instrument in the field of electronic measurement, which is used to collect, display and store waveforms, and can also analyze various parameters. Oscilloscopes have many acquisition modes, one of which is averaging. This mode will average continuously acquired waveform points, filter out noise and signal glitches without compromising bandwidth, but the requirement is a periodic signal. Suitable for power quality analysis or harmonic analysis, etc. The stored waveform of the oscilloscope can be stored in the internal memory of the FPGA, or in an external memory with a large capacity. The waveform collected once can be stored continuously, and the waveform can also be stored in segments. Segmented memory divi...

AI Technical Summary

Problems solved by technology

In the case of relatively large average times, the software has a large amount of calculation, and the calculation speed cannot keep up with the refresh rate of the waveform.

Moreover, the software is also responsible for other control and calculation of the oscilloscope, so the average operation will cause the overall performance of the oscilloscope to decline

The average sampling mode implemented by software also has a disadvantage, that is, it cannot stop waveform stretching and compression, because the software deals with limited display points, not original points

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