Waveform searching method of digital oscilloscope

Abstract

The invention discloses a waveform searching method of a digital oscilloscope. In a hardware cooperation processing apparatus, according to a related waveform parameter set by a user, an analog signal passing through a signal conditioning circuit and a signal shaping circuit of the digital oscilloscope is converted into one path or two path digital signals. The digital signals enter into a waveform searching module selected by the user. The waveform searching module continuously detects whether an input digital signal flow accords with a logic level of a user setting parameter under a system clock of a FPGA and initial time Ts when the logic level appears is stored in waveform searching data memory. A microprocessor reads time data from the memory and then a corresponding position of a marking point on a screen is calculated according to a time base gear of the current digital oscilloscope.

Description

technical field [0001] The invention belongs to the technical field of waveform search, and more particularly, relates to a waveform search method of a digital oscilloscope. Background technique [0002] As the most common test instrument, oscilloscopes are widely used in various industries, and a feature-rich oscilloscope can be favored by more users. With the rapid development of electronic technology and semiconductor technology, electronic circuit systems are becoming more and more complex, and the amount of data transmission is also increasing. It is no longer enough to capture the waveform features that users are interested in by adjusting the trigger type of the oscilloscope. Quickly searching out all the waveform features that users care about from massive data can meet the testing requirements of today's complex electronic circuit systems. [0003] Due to the relatively short research time in the domestic oscilloscope industry, the "field programmable logic device ...

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Problems solved by technology

[0006] (2) Reduce the waveform capture rate

This process of successive comparisons wastes a lot of oscilloscope processing time and prolongs the dead time D of waveform acquisition. As can be seen from the above formula, it also reduces the waveform capture rate.

[0010] (3) Small scope

The storage capacity of the display buffer area is small, only a few hundred sampling points, and the number of waveforms of interest to the user is small, or the waveform features of interest to the user cannot be searched at all, but the waveform features of interest to the user exist

At the same time, the waveform features in the massive waveform database in the oscilloscope cannot be searched, which also greatly reduces the efficiency of the oscilloscope

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