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Oscilloscope high speed signal reconstruction method

A high-speed signal and oscilloscope technology, applied in the direction of digital variable display, etc., can solve problems such as the reduction of measurement and display accuracy, and achieve the effect of reducing system overhead, reducing the amount of calculation, and correcting waveform distortion

Active Publication Date: 2009-06-24
UNI TREND TECH (CHINA) CO LTD
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Problems solved by technology

This distortion will greatly reduce the accuracy of measurement and display, which is unacceptable for the design of high-speed broadband oscilloscopes

Method used

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  • Oscilloscope high speed signal reconstruction method
  • Oscilloscope high speed signal reconstruction method
  • Oscilloscope high speed signal reconstruction method

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Embodiment Construction

[0025] The high-speed signal reconstruction method of the oscilloscope provided by the present invention will be described in detail below in conjunction with the accompanying drawings, but it does not constitute a limitation to the present invention.

[0026] Through computer simulation of the interpolation filter and hardware system experiment, it is determined that the optimal number of interpolation points in the high-speed data acquisition system is 60. The time-domain impulse response of the filter is theoretically infinite, but in engineering applications, only finite-length filters can be used. Therefore, it is impossible to interpolate all the sampled values ​​of the signal in practice. It should be folded with an appropriate number of points. , Which introduces interpolation errors. For continuous H in the frequency domain d (e jω ) When sampling, when the sampling points are calculated with more than 60 points, the error curve has passed the inflection point. If the num...

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Abstract

The invention provides a high-speed signal reconstruction method of an oscilloscope, which belongs to the technical field of high-speed broadband oscilloscopes. The method includes: sampling the original band-limited signal x(t) to obtain a sequence x(n), and inserting a plurality of zero-value points equidistantly between two adjacent actual sampling points to obtain a new sequence m(n); using The interpolation filter performs low-pass filtering on the spectrum M(ejω) of m(n), and separates the baseband component X(ejω) of the original signal; performs inverse Fourier transform on the baseband component X(ejω) of the above original signal, and obtains the original Signal after interpolation. Wherein, the above-mentioned interpolation filter is constructed using a frequency domain sampling method. Compared with the traditional high-speed signal reconstruction method of the oscilloscope, the invention can effectively correct the waveform distortion caused by spectrum leakage, the physical characteristics of the output signal are completely consistent with the original signal, and the purpose of high-quality reconstruction of the original signal is achieved.

Description

Technical field [0001] The invention belongs to the technical field of high-speed broadband oscilloscopes, and specifically relates to a high-speed signal reconstruction method of an oscilloscope. Background technique [0002] In high-speed digital systems, reflections, interference or ground potential jumps caused by mismatch or unconnected terminal transmission lines, burrs and oscillations caused by bus competition are often non-periodic; fast edge signals are often contained above their basic frequency Important harmonic information. If the bandwidth of the digital oscilloscope is insufficient, the high-frequency components of the displayed waveform will be reduced, the pulse edge will be slow, the amplitude of the high-frequency signal will be reduced, the displayed waveform will be distorted or even aliased, so the ultra-high-speed digital instrument used to capture them must be sampled and displayed in real time come out. At present, using parallel alternating technology, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R13/02
Inventor 田书林黄建国潘卉青曾浩叶芃
Owner UNI TREND TECH (CHINA) CO LTD
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