Multichannel logic analyzer with synchronous signal self-calibration function

Abstract

The invention discloses a multichannel logic analyzer with a synchronous signal self-calibration function. A calibration signal generation module, a channel selection module, an edge detection module and a deviation calculation module are added to the multichannel logic analyzer, wherein the calibration signal generation module is used for generating calibration signals, wherein one-time signal edge jump happens to the calibration signals during a process of storing calibration data acquired at one time; the channel selection module is used for carrying out switching between a standard mode and a normal acquisition mode; the edge detection module carries out edge detection on acquisition data for calibration signals in each channel to detect and obtain the serial number of a sampling point of the jump edge in the channel storage data in the storage data; and the deviation calculation module is used for calculating the synchronous deviation value of each channel relative to a reference channel according to the serial number of the sampling point of the jump edge and sending the synchronous deviation value to an upper computer to synchronize the actually-acquired data. Thus, the relative synchronous deviation between channels can be accurately detected, and precise synchronization between the multiple channels is realized.

Description

technical field [0001] The invention belongs to the technical field of logic analyzers, and more specifically relates to a multi-channel logic analyzer with a synchronous signal self-calibration function. Background technique [0002] The rapid development of digital circuits has brought about an increase in the sampling and analysis rate of the logic analyzer, a general-purpose test instrument in the data domain, which means that the analysis of channel data by the high-speed logic analyzer is more refined. At the same time, as a multi-channel test instrument, the logic analyzer is often used to observe and analyze the logic and timing relationship between multiple digital signals at the same time, so the synchronization between multiple channels has always been used as a measure of the analysis performance of a logic analyzer. key indicator. The better the synchronization effect between multiple channels, the more accurate the observation and analysis of multiple signals ...

AI Technical Summary

Problems solved by technology

If for a high-speed logic analyzer with a maximum timing analysis rate of 20GS / s, its minimum sampling interval is only 50ps, obviously ns-level deviation will greatly reduce its analysis performance

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