Adjustable sample-taking velocity high speed high-accuracy data collection card

Abstract

The high-speed and high-precision data acquisition card with adjustable sampling rate is a special device for collecting weak signals with extremely high signal-to-noise ratio and extremely high sampling rate. The output terminal of the impedance matching network (1) is connected to the input of the differential converter (2) terminal, the output terminal of the differential converter (2) is connected to the analog input terminal of the high-speed high-precision analog-to-digital converter (3), and the output of the low-phase-noise clock source (4) is respectively connected to the clock of the high-speed high-precision analog-to-digital converter (3) Input end and the input end of clock buffer driver (6), high-speed high-precision analog-to-digital converter (3) connects the input end of high-speed FIFO (5), and the data output end in the high-speed FIFO (5) connects CPLD control circuit (7) ), the clock buffer driver (6) outputs the isolated same-frequency clock signal and connects the CPLD control circuit (7) and the interface circuit (8), and the CPLD control circuit (7) is to the clock from the clock buffer driver (6) After frequency division, the output is connected to the input end of the interface circuit (8).

Description

technical field [0001] The invention is a data acquisition card used in a data acquisition system, in particular a special device for collecting weak signals with a very high signal-to-noise ratio and a very high sampling rate. Background technique [0002] The high-speed and high-precision data acquisition card is a special device that collects and quantizes analog signals into data with extremely high signal-to-noise ratio and extremely high sampling rate. It can accurately restore, detect and measure weak signals submerged by noise background, especially suitable for strong noise signal detection applications, medical biological parameter measurement, radar, sonar signal reception, optical fiber sensing data processing and other fields. [0003] Existing data acquisition cards mainly have the following deficiencies: [0004] First, speed metrics and accuracy metrics are rarely achieved simultaneously. According to our investigation, the data acquisition card with a samp...

AI Technical Summary

Problems solved by technology

For many high-end applications, the performance is not enough

[0005] Secondly, the various existing commercial data acquisition cards often only focus on the quantization accuracy, without considering the accuracy of the actual acquisition results

Due to the neglect of the unique nature of high-speed and high-precision data acquisition, there are many unreasonable points in the system design, resulting in performance degradation, and the actual accuracy is far lower than the quantization accuracy

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