Digital oscilloscope with equivalent sampling function, and equivalent sampling method for digital oscilloscope

Abstract

The invention discloses a digital oscilloscope with an equivalent sampling function. The digital oscilloscope comprises a clock source module for generating a sampling clock signal, a triggering module for generating a triggering signal, a sampling module for receiving a measured signal and the sampling clock signal and generating a plurality of sampled data, a phase difference measuring module for generating a phase adjusting signal, and a phase adjusting module for adjusting the displayed positions of the plurality of sampled data according to the phase adjusting signal, wherein the phase difference measuring module comprises a delay chain module for receiving the triggering signal, delaying the triggering signal according to a plurality of different delay values and generating a plurality of delayed signals and a triggering output module for receiving the delayed signals and the sampling clock signal, and outputting the phase adjusting signal according to levels of the delayed signals at the triggering moment of the sampling clock signal under the triggering of the sampling clock signal. The digital oscilloscope consists of digital circuits, and cannot be influenced by factors, such as noise and the like; and the waveform fluctuation degree is low.

Description

technical field [0001] The invention relates to a digital oscilloscope, in particular to a digital oscilloscope with an equivalent sampling function and an equivalent sampling method for the digital oscilloscope. Background technique [0002] In digital oscilloscope technology, there are two commonly used sampling methods: real-time sampling and equivalent sampling. Real-time sampling usually samples periodic or non-periodic signals at equal time intervals, and the highest sampling frequency of real-time sampling is the Nyquist limit frequency. Equivalent Sampling refers to continuous sampling of multiple periods of a periodic signal and combining them into one period to reproduce the signal waveform. The waveform of a signal whose frequency greatly exceeds the Nyquist limit frequency can be reproduced by using the method of equivalent sampling. [0003] Please refer to figure 1 , figure 1 Shown is a digital oscilloscope with an equivalent sampling function. The digital...

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Problems solved by technology

[0021] The technical problem to be solved by the present invention is to solve the problem that the digital oscilloscope in the prior art is easily affected by noise and other factors and has a low waveform refresh rate, and to provide a digital oscilloscope with an equivalent sampling function that is not easily affected by noise and has a high waveform refresh rate. digital oscilloscope

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