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Channel presetting method for analog-digital joint data acquisition device

A data acquisition and channel technology, applied in the direction of analog/digital conversion, signal transmission system, instrument, etc., can solve the problems of adding extra time, limiting the bandwidth of the acquisition system, and failing to meet the needs of high-frequency signal acquisition, etc., to achieve high bandwidth and high speed Effects of data acquisition and expansion of sampling range

Inactive Publication Date: 2010-12-01
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a channel preset method for an analog-digital combined data acquisition device, to solve the problem of increasing the extra time from changing the gain to AD sampling in the existing method, limiting the bandwidth of the acquisition system, and unable to meet rapidly changing high-frequency signals The collection needs of the problem

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  • Channel presetting method for analog-digital joint data acquisition device
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Embodiment Construction

[0021] The principle block diagram of the embodiment of the present invention is as figure 1 As shown, it mainly includes the channel parameter preset of the parallel multi-channel analog amplification and conditioning circuit and the sampling channel preset of the digital control module.

[0022] The channel parameters of parallel multi-channel analog amplification and conditioning circuits mainly include the number N of parallel circuits and the amplification factor K of each circuit, K n =B×A n-1 , n represents the nth circuit or the nth channel of the parallel circuit, n = 1,..., N; B is a constant, which is the amplification factor of the first analog amplification and conditioning circuit of the parallel multi-channel analog amplification and conditioning circuit; A is The ratio of the amplification factors of two adjacent analog amplification and conditioning circuits in parallel multi-channel analog amplification and conditioning circuits, the preset of these paramete...

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Abstract

The invention relates to a channel presetting method for an analog-digital joint data acquisition device, which comprises the following steps: firstly presetting the number N of circuit channels of a plurality of parallel analog enlargement conditioning circuits, the enlargement factor K of each circuit channel and an AD sampling initial channel; leading an analog input signal to pass through theinitial analog enlargement conditioning circuit and the plurality of the parallel analog enlargement conditioning circuit for enlargement, and then be enlarged with different enlargement factors by Nchannels; then leading a digital control module to trigger the AD conversion of all the channels in a timing manner, triggering the interruption of a CPU and reading sampled values of the preset AD sampling initial channel; using the digital control module to analyze and compare the sampled values; and carrying out presetting of the sampling channels The method can select the range and the channels according to the intensity and the change trend of the input signal, dynamically change the gain, expand the sampling range, ensure the sampling precision of the weak signal, avoid the big signal from exceeding the range, further not increase the sampling holding acquisition time when changing the gain, not affect the sampling rate and the bandwidth of a system and realize the high-bandwidth high-speed data acquisition.

Description

technical field [0001] The invention relates to a channel preset method of an analog-digital combined data acquisition device which is carried out by combining an analog circuit and a digital control circuit, and belongs to the technical field of data acquisition. Background technique [0002] During the measurement process, the magnification and range of the test circuit must be able to dynamically change with the change of the analog input signal. The general acquisition method and acquisition system are an analog signal connected to an analog amplifier circuit and an AD sampling channel. The analog amplifier circuit usually uses a programmable gain amplifier circuit to automatically change the gain of the amplifier, but this method increases from changing the gain to AD sampling. It takes extra time, limits the bandwidth of the acquisition system, and cannot meet the acquisition needs of fast-changing high-frequency signals. Contents of the invention [0003] The purpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/54
Inventor 李济顺韩红彪库祥臣薛玉君司东宏罗天宇
Owner HENAN UNIV OF SCI & TECH
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