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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 effects of reducing system overhead, correcting waveform distortion, and reducing the amount of calculation.

Active Publication Date: 2008-02-20
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

[0023] 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 this does not constitute a limitation to the present invention.

[0024] Through the computer simulation and hardware system experiment of the interpolation filter, it is determined that the optimal number of points for interpolation in the high-speed data acquisition system is 60. The time-domain impulse response of the filter is theoretically infinite, but only finite-length filters can be used in engineering applications, so it is impossible to take all the sampled values ​​of the signal for interpolation in practice, and it should be converted with an appropriate number of points , this introduces an interpolation error. In the frequency domain for continuous H d (e jω ) for sampling, when the sampling points are calculated with more than 60 points, the error curve has passed the infl...

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Abstract

The utility model provides a reconstruction method for the high speed signals of the oscillograph, belonging to the technical filed of the high speed broad band oscillograph, which comprises sampling the original tape limit signal x (t) to get the sequence x (n), inserting a plurality of zero value spots in equal space between two neighboring actual sampling points to get a new sequence m (n); carrying on low-pass filtering to the frequency spectrum M (ejOmega) of the m (n) with the interpolation filter and then separating the baseband weight X (ejOmega) of the original signals; making fourier inversion to the baseband weight X (ejOmega) to get the interpolation signals of the original signals; wherein, the interpolation filter is constructed with the method of frequency-domain sampling. Comparing with the traditional reconstruction method for the high speed signals, the utility model has the advantages of enabling to effectively revise the waveform distortion because of the divulging of the frequency spectrum, and achieving the aim of reconstructing the original signals in high quality due to the physical feature of output signals are completely consistent with the original signal.

Description

technical field [0001] The invention belongs to the technical field of high-speed broadband oscilloscopes, and in particular relates to a high-speed signal reconstruction method of an oscilloscope. Background technique [0002] In high-speed digital systems, reflections caused by mismatched or unterminated transmission lines, scrambling or ground potential jumps, glitches and oscillations caused by bus competition are often non-periodic; fast edge signals are often included above their fundamental 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 become slower, the amplitude of the high-frequency signal will be reduced, and the displayed waveform will be distorted or even aliased. Therefore, the ultra-high-speed digital instrument used to capture them must be sampled and displayed in real time. come out. At present, using parall...

Claims

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Application Information

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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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