Device and method for improving data sampling precision in oscillograph

Abstract

The invention relates to a clock signal phase correcting unit and a clock signal phase correcting method. The clock signal phase correcting unit comprises a multi-path analog-to-digital conversion unit, a clock signal generating unit, a phase correcting signal generating unit, a phase comparing unit and a clock phase control unit; the phase correcting signal generating unit is used for generating phase correcting signals; the multi-path analog-to-digital conversion unit performs analog-to-digital conversion processing to the phase correcting signals to output at least two paths of digital signals; the phase comparing unit is used for comparing the phase of any two paths of digital signals and outputting phase difference; the clock phase control unit generates control signals according to the phase difference; and the clock signal generating unit regulates the phase of the clock signals according to the control signals. The clock signal phase correcting unit has the advantage of high sampling precision.

Description

technical field [0001] The invention relates to a device and method for improving data sampling precision in an oscilloscope. Background technique [0002] In the current oscilloscope development, in order to increase the sampling rate, usually multiple relatively low-speed analog-to-digital converters are used to form a system with a higher sampling rate. The specific implementation method is to control the sampling clock phase input to the analog-to-digital converter, according to the number of analog-to-digital converters used, the output multi-channel clock phase is evenly distributed within 360 degrees, and finally multiple analog-to-digital conversion The data sampled by the device is arranged in order according to the clock phase, forming a system with a higher sampling rate. [0003] figure 1 is a schematic diagram of a conventional data acquisition system. A traditional data acquisition system usually includes an analog signal input channel, a multi-channel analo...

AI Technical Summary

Problems solved by technology

The phase of the clock signal of the traditional data acquisition system is fixed, similar to an open-loop system, so the inherent error between the clock signals cannot be eliminated

It is also impossible to dynamically adjust the phase error of the clock signal according to the differences between chips and hardware of different machines, and changes in the ambient temperature.

As a result, the sampling accuracy of the data acquisition system is relatively low

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