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, which comprises a clock source module for generating a sampling clock signal; a trigger module for generating a trigger signal; a sampling module for receiving a measured signal and a sampling clock signal , to generate a plurality of sampling data; the phase difference measurement module is used to generate a phase adjustment signal; and the phase adjustment module is used to adjust the displayed position of a plurality of sampling data according to the phase adjustment signal; the phase difference measurement module includes: a delay chain module , used to receive the trigger signal, and delay the trigger signal with multiple different delays to generate multiple delayed signals; the trigger output module is used to receive the delayed signal and the sampling clock signal, triggered by the sampling clock signal, according to the delay The level of the signal at the trigger moment of the sampling clock signal is outputted as a phase adjustment signal. The digital oscilloscope of the present invention is composed of digital circuits, so it is not easily affected by noise and other factors, and the waveform jitter is small.

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 (Equivalent Sampling) refers to the 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 sampl...

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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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