Crosstalk measurement analysis method for high-speed ADC circuit board based on frequency-domain characteristics

A technology of measurement and analysis, frequency domain characteristics, applied in the field of high-speed circuit signal integrity and power integrity test analysis, can solve the inner circuit noise crosstalk, affect circuit performance, cannot analyze and determine the critical path and strong coupling area of ​​coupling, etc. problem to improve the accuracy

Active Publication Date: 2018-08-14
SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

This also makes the inner layer circuit noise crosstalk a major hidden danger affecting circuit performance
[0005] Existing crosstalk analysis techniques mainly use techniques such as impulse response measurement and analysis. This technique can determine the coupling characteristics of the overall line to a certain extent, but cannot analyze and determine the critical path and strong coupling area of ​​specific coupling.
In addition, there are spectrum scanners abroad that can obtain the spatial distribution of the frequency signal strength above the tested circuit board, mainly measuring the spatial radiation characteristics of the signal inside the board, which can characterize the coupling capability of the model to a certain extent, but cannot directly analyze and determine the internal The noise coupling characteristics of

Method used

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  • Crosstalk measurement analysis method for high-speed ADC circuit board based on frequency-domain characteristics
  • Crosstalk measurement analysis method for high-speed ADC circuit board based on frequency-domain characteristics
  • Crosstalk measurement analysis method for high-speed ADC circuit board based on frequency-domain characteristics

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Embodiment 1

[0033] Such as figure 1 A kind of crosstalk measurement and analysis method of the high-speed ADC circuit board based on the frequency domain characteristic of the present invention shown, comprises the following steps:

[0034] S1: After the ADC circuit board is powered on and running, it is preferable to use an oscilloscope to detect and extract the noise waveform of the analog input pin of the AD chip;

[0035] S2: Perform Fourier transform on the data of the noise waveform, extract the frequency domain characteristics of the noise, screen out the frequency points with large frequency domain values ​​and appearing stably, and match with the main frequency and harmonic multiplier frequency of the potential interference source. If they are consistent, it is the corresponding interference source;

[0036] S3: Use the spectrum analyzer and near-field probe to detect the strength of the noise frequency point along the analog receiving line, and record the position with the high...

Embodiment 2

[0048] One embodiment of the practice of the present invention is provided below, in a shielded room, in the absence of an input signal to operate the frequency sweep function of the circuit. The measurement results show that a large number of coupled noise signals appear in the scanning results of the circuit, and the intensity is mostly above -110dBm, such as figure 2shown. Since there is no external interference signal in the shielding room, it means that there is an internal interference source in the circuit. The following analysis is performed. First, a near-field probe is used to scan the circuit board in the working state comprehensively, and then four parts of the clock circuit area can be found. The strength of the 10M harmonic signal is the largest, and the RF sampling front-end circuit can also detect 40m and its harmonic signals. Then, we partially masked the clock region. Measurement results such as image 3 As shown, the intensity of the same harmonic freque...

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Abstract

The invention relates to a crosstalk measurement analysis method for a high-speed ADC circuit board based on frequency-domain characteristics. The crosstalk measurement analysis method includes the following steps that S1, an ADC circuit board is powered on and runs, and then a noise waveform of an ADC-chip analog input pin is extracted; S2, data of the noise waveform is subjected to fourier transformation, the frequency-domain characteristics of noise are extracted, frequency points which are large in frequency-domain value and capable of stably appearing are screen out, and are matched withmain frequencies and harmonic frequency doubling frequencies of potential interference sources, and if matching is coincident, the matched potential interference sources are corresponding interferencesources; S3, intensities of noise frequency points are detected along an analog receiving circuit, and a position with a maximal interference intensity is recorded; S4, according to the position withthe highest interference on the analog receiving circuit and the position of an interference source circuit, it exists that wirings of two adjacent positions are potential interference coupling pathssimultaneously. By means of the crosstalk measurement analysis method for the high-speed ADC circuit board based on the frequency-domain characteristics, interference sources and potential interference coupling paths can be obtained by extracting the frequency-domain characteristics, and an important measured-data support can be provided for crosstalk trouble removing and designing and simulationanalyzing.

Description

technical field [0001] The invention relates to a crosstalk measurement and analysis method of a high-speed ADC circuit board based on frequency domain characteristics, and belongs to the field of high-speed circuit signal integrity and power integrity test and analysis. Background technique [0002] In recent years, with the development of IC technology, integrated circuit design has become increasingly miniaturized and integrated. Line crosstalk has become an unavoidable key issue in circuit design. In addition, the high-speed ADC circuit board is a high-end electronic product with high technical content, strict performance index requirements, and relatively difficult design and manufacture. High-speed ADC boards are widely used in many high-end fields, from wireless radio frequency communication to biomedical signal detection and so on. [0003] The signals detected by this type of circuit are different, but the basic principles are basically the same. Most of them conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/28
CPCG01R31/2856
Inventor 陈晓禾郭宇郦政韦阳郭健
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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