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Large-amplitude-range signal collection and processing device

A technology of amplitude range and processing device, applied in the electronic field, can solve problems such as inability to extract signals and signal distortion, and achieve the effects of improving sensitivity, avoiding distortion, and removing noise interference

Inactive Publication Date: 2018-03-13
SICHUAN JINJIANG ELECTRONICS SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it can only effectively process input signals with a certain amplitude range. For signals with a wide range of input amplitudes (for example, 0mA-250mA or 0V-10V), the subsequent circuits will be truncated, thus Causes signal distortion; for an input signal with too small amplitude, due to the influence of noise, it will be impossible to extract the required signal from the collected signal

Method used

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  • Large-amplitude-range signal collection and processing device

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Embodiment 1

[0023] Such as figure 1 As shown, the device for collecting and processing wide-amplitude signals disclosed in Embodiment 1 of the present invention includes: sampling electrodes, N-stage amplifier circuits, N collection circuits, and a central processing unit; wherein, N is a positive integer greater than or equal to two (for example, N=4), in a preferred embodiment, a larger or smaller four-stage amplifying circuit may be used according to the amplitude of the wide-amplitude range signal.

[0024] The sampling electrode is used to obtain the input wide-amplitude range signal; the first-stage amplifying circuit is connected to the sampling electrode and is used to amplify the wide-amplitude range signal, obtain the first-stage amplified signal and send it to the first acquisition circuit and the second stage amplifier circuit; in a preferred embodiment, the first stage amplifier circuit can adopt an instrument differential amplifier circuit with a high common-mode rejection r...

Embodiment 2

[0031] Such as figure 2 As shown, the first-stage amplifying circuit in the wide-amplitude-range signal acquisition and processing device disclosed in Embodiment 2 of the present invention includes a preamplifier circuit, a high-pass filter circuit, a trap circuit, a main amplifying circuit, and a low pass filter circuit.

[0032] Specifically, the preamplifier circuit can use an instrument differential amplifier AD7794 with a common-mode rejection ratio of 150dB, and the magnification factor can be set to 1; the high-pass filter circuit uses an LC high-pass filter circuit with a cutoff frequency of 20Hz to filter out 20Hz The low-frequency signal below; the trap circuit adopts a 50Hz trap circuit, which can effectively remove 50Hz power frequency interference; the low-pass filter circuit adopts an LC low-pass filter circuit with a cut-off frequency of 500Hz to filter out high-frequency signals above 500Hz; the main The amplifying circuit adopts a TL084 amplifier with a magn...

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Abstract

The invention discloses a large-amplitude-range signal collection and processing device, and the device comprises a sampling electrode, an N-stage amplification circuit, N sampling circuits, and a central processor. The M-th-stage amplification circuit is connected with the (M-1)-th-stage amplification circuit and the M-th sampling circuit, and is used for amplifying an (M-1)-th-stage amplification signal, obtaining an M-th-stage amplification signal, and transmitting the M-th-stage amplification signal to the M-th sampling circuit. The central processor sequentially selects data from an N-type piece of data to a first piece of data, compares the selected data with a preset data range, and takes the data as output data when the data is within the preset data range. The device is high in sensitivity of data collection, and can accurately obtain high-precision output data in the preset data range.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a device for collecting and processing signals in a wide amplitude range. Background technique [0002] Electrophysiological Techniques is a technology that stimulates organisms with various forms of energy (electricity, sound, etc.), measures, records and analyzes electrical phenomena (bioelectricity) and electrical characteristics of organisms. The main techniques of physiology research. Usually the electrical signal of a living organism is very weak, generally at the millivolt level, and some even at the microvolt level, so it needs to be pre-amplified before it can be recorded by an instrument or collected by a signal acquisition device. [0003] In the prior art, for the acquisition of the input signal, a common method is to first amplify or reduce the signal to within the acquisition range of the acquisition circuit, and the amplitude should be as large as possible to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/00
CPCH03M3/408
Inventor 张箭
Owner SICHUAN JINJIANG ELECTRONICS SCI & TECH CO LTD