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Digital oscilloscope multi-channel ADC cross sampling circuit with automatic calibration function and calibration method thereof

A digital oscilloscope and automatic calibration technology, applied in the field of signal processing, can solve problems such as abnormal operation of the oscilloscope, distortion of sampling waveform, mismatch of oscilloscope calibration parameters, etc.

Active Publication Date: 2020-12-11
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the aging of the instrument and changes in temperature and humidity, the calibration parameters of the oscilloscope will be mismatched, and the sampling waveform will be distorted, resulting in abnormal operation of the oscilloscope.

Method used

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  • Digital oscilloscope multi-channel ADC cross sampling circuit with automatic calibration function and calibration method thereof
  • Digital oscilloscope multi-channel ADC cross sampling circuit with automatic calibration function and calibration method thereof
  • Digital oscilloscope multi-channel ADC cross sampling circuit with automatic calibration function and calibration method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1 The digital oscilloscope multi-channel ADC cross-sampling circuit with automatic calibration function provided in this embodiment, taking the four-channel ADC cross-sampling circuit as an example, its circuit structure block diagram is as follows figure 1 As shown, it mainly includes four parts: calibration signal generation module, 5GHz clock generation and synchronization module, 40GSa / s acquisition module and digital signal processing module. The 40GSa / s sampling rate is realized through four channels of 10GSa / s sampling rate ADC cross-sampling , and can realize the automatic calibration of the gain, offset and phase of four ADCs.

[0033] (1), calibration signal production module

[0034]In this embodiment, the calibration signal production module is mainly composed of four parts: a DC signal generation unit, a sinusoidal signal generation unit, a switch selection unit and a signal distribution unit. The DC signal generation unit mainly generates the D...

Embodiment 2

[0047] Embodiment 2 The second embodiment provided by the present invention is an automatic calibration method for the above-mentioned four-way ADC cross-sampling circuit. The specific steps and process of the method are as follows:

[0048] (1) Calibration of gain and offset

[0049] In order to eliminate offset and gain errors, the input signal is chosen as DC. The ADC acquisition data model is represented by Equation 1:

[0050] sample=offset+gain*real (1)

[0051] Among them: sample is the acquisition signal, offset is the ADC offset, gain is the ADC gain, and real is the measured real value.

[0052] Using the collected data, use the following equations to solve.

[0053]

[0054] in, Indicates the average value of the low voltage signal collected by ADC1, offset1 indicates the offset of ADC1, gain1 indicates the gain of ADC1, real low Indicates the real value of low voltage, other parameters and so on.

[0055] When two 10GSa / s ADCs collect low-voltage DC signa...

Embodiment 3

[0065] Embodiment 3 The digital oscilloscope multi-channel ADC cross-sampling circuit with automatic calibration function provided in this embodiment, taking the eight-channel ADC cross-sampling circuit as an example, its circuit structure is similar to that of Embodiment 1, mainly including: calibration signal generation module, 5GHz clock The generation and synchronization module, the 80GSa / s acquisition module and the digital signal processing module are composed of four parts, and the 80GSa / s sampling rate can be realized through the cross-sampling of eight ADCs with a sampling rate of 10GSa / s, and the gain, offset and phase of the eight ADCs can be realized. Automatic calibration.

[0066] (1) Calibration signal production module

[0067] In this embodiment, the calibration signal production module is mainly composed of four parts: a DC signal generation unit, a sinusoidal signal generation unit, a switch selection unit and a signal distribution unit. The DC signal gener...

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Abstract

The invention belongs to the technical field of signal processing, and relates to a digital oscilloscope multi-channel cross sampling circuit and a calibration method thereof. A digital oscilloscope multi-channel ADC cross sampling circuit with an automatic calibration function is mainly composed of a calibration signal generation module, a clock generation and synchronization module, an acquisition module and a digital signal processing module. Through cross sampling of multi-channel ADCs, the sampling rate is improved, automatic calibration of gains, offsets and phases of the multi-channel ADCs is supported at the same time, and particularly when the environment temperature changes, the circuit has a temperature recognition function, temperature changes can be recognized, automatic calibration is achieved again, and therefore the correctness of sampling waveforms is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a digital oscilloscope multi-channel cross sampling circuit and a calibration method. Background technique [0002] The analog-to-digital converter (ADC) is the core component of the oscilloscope, which determines the three core indicators of the oscilloscope's bandwidth, sampling rate and vertical resolution. Limited by the level of domestic semiconductor technology, it has been impossible to develop ADC chips with large bandwidth and high sampling rate in China. In order to increase the sampling rate of the oscilloscope, domestic oscilloscope manufacturers use multiple ADC chips to achieve it through time-domain interleaving technology. [0003] Due to the individual differences of multiple ADC chips, the quantization of the same signal by different ADC chips under the same conditions is not exactly the same. Changes in temperature and humidity, resulting in a mismatc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R13/02G01R35/00
CPCG01R13/0272G01R13/029G01R13/0254G01R35/005
Inventor 刘洪庆向前李云彬刘永王生伟褚晓东
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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