Bandwidth compensating device of channel of digital oscilloscope

A digital oscilloscope and compensation device technology, applied in the direction of digital variable display, etc., can solve problems such as relationship deterioration and achieve the effect of increasing bandwidth

Inactive Publication Date: 2010-05-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

However, system noise, frequency domain response, and time domain response are mutually restrictive. The peak network increases the channel bandwidth, which will introduce noise to the input signal; excessive frequency domain compensation will also introduce overshoot or damping to the time domain signal. Therefore, Compensating the bandwidth of the oscilloscope from an analog point of view will lead to further deterioration of the relationship between the three

Method used

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  • Bandwidth compensating device of channel of digital oscilloscope
  • Bandwidth compensating device of channel of digital oscilloscope
  • Bandwidth compensating device of channel of digital oscilloscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] 1. Acquisition of the frequency response amplitude-frequency characteristics of the input channel

[0036] In the specific implementation process, it is first necessary to obtain the frequency response amplitude-frequency characteristics of the input channel, usually the following two methods can be used:

[0037] 1), sine sweep

[0038] Perform sinusoidal excitation on the input channel, keep the amplitude of the excitation force constant, change the excitation frequency according to a certain rule, and pick up the vibration response of the input channel, so as to obtain the frequency response amplitude-frequency curve of the input channel.

[0039] 2), pulse excitation

[0040] The input channel is excited by the pulse signal, and the input and output of the input channel are Fourier transformed, and the frequency response amplitude-frequency curve can be calculated.

[0041] Use the pulse excitation method to obtain the system channel frequency response:

[0042] ...

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PUM

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Abstract

The invention discloses a bandwidth compensating device of a channel of a digital oscilloscope, which comprises a frequency-amplitude characteristic channel compensating filter of which the frequency response is reciprocal with that of an input channel and which compensates for the frequency response for waveform data output by a high-speed analogue-to-digital converter and then outputs the waveform data, and a low pass filter designed according to indexes required by a needed channel for performing secondary filtration of the waveform data after the frequency response compensation and compensating for the input channel response to form an ideal channel response to correct the frequency response of the input channel to increase the bandwidth of the channel. The bandwidth compensating device of the channel of the digital oscilloscope compensates for the frequency of the digital waveform data after digital-to-analogue conversion of the input channel, so the bandwidth compensating device does not introduce signal overswing when compensating for the digital oscilloscope channel.

Description

technical field [0001] The invention relates to the technical field of digital storage oscilloscopes, in particular to a channel bandwidth compensation device for digital oscilloscopes. Background technique [0002] The digital oscilloscope converts the continuously changing measured analog signal into discrete waveform data through a high-speed analog-to-digital converter (ADC), stores and processes the waveform data, and then reproduces the waveform so that the user can intuitively view the waveform in the time domain. Observe the signal under test. [0003] With the changes of high-speed and complex signals in the fields of communication and data storage, higher requirements are put forward for the analysis ability of digital oscilloscopes, and the ability of digital oscilloscopes to analyze high-speed signals depends on high bandwidth and high sampling rate. [0004] The sampling rate of digital oscilloscopes doubles at an average rate of 2 to 2.5 years, but the channel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R13/02
Inventor 田书林潘卉青叶芃曾浩罗光坤
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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