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

Abstract

A high-speed high-precision data collecting card with adjustable sampling speed relates to a special device which collects weak signal with an extremely high Signal-to-Noise and an extremely high sampling speed. The output end of an impedance matching network (1) is connected with the input end of a difference convertor (2). The output end of the difference convertor (2) is connected with the simulating input end of a high-speed high-precision data convertor (3). The output of a low phase noise clock source (4) is respectively connected with the clock input end of the high-speed high-precision data convertor (3) and the input end of a clock buffer driver (6). The high-speed high-precision data convertor (3) is connected with the input end of a high-speed FIFO (5). The data output end in the high-speed FIFO (5) is connected with the data input end of a CPLD control circuit (7). The output of the clock buffer driver (6) is connected with the CPLD control circuit (7) and an interface circuit (8) by passing through an isolated clock signal with the same frequency. The CPLD control circuit (7) outputs the clock from the clock buffer driver (6) after frequency demultiplication and is connected with 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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