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Sampling method and system for multi-channel analog signal

An analog signal, sampling system technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve the problems of low sampling rate, low sampling speed, poor anti-interference ability, etc. accuracy, high anti-interference ability, and the effect of increasing the sampling rate

Inactive Publication Date: 2007-08-08
张金贵
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The analog signal acquisition system of general electronic instruments or equipment includes analog signal conditioning circuit, analog signal transmission circuit, analog / digital conversion circuit, digital signal communication circuit and sampling control processing device. signal, the anti-common-mode interference ability is poor; multiple channels of the analog / digital converter share one channel, when multi-channel synchronous sampling is required, the signals of each channel must be stored by the sample holder first, and then switched in sequence with the analog electronic switch to realize the separation Time conversion, the sampling speed is not high; A / D converters mostly adopt the principle of bit-by-bit comparison method, the result is easily interfered by various noises and make mistakes; the digital signal communication circuit connecting A / D converters and processors can be selected in parallel or serial form
The use of this sampling transmission technology has poor anti-interference ability, low sampling rate, high cost, complex interface with the processor, relatively poor sampling accuracy, sampling speed and stability, which has a great impact on the competitiveness of products.

Method used

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  • Sampling method and system for multi-channel analog signal
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  • Sampling method and system for multi-channel analog signal

Examples

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Embodiment 1

[0029] An analog signal channel sampling method for electronic instruments or equipment, wherein the hardware circuit part consists of an analog signal conditioning circuit, a 16-bit Σ / Δ principle analog-to-digital converter, a differential transmission circuit for high-speed serial communication, and a microprocessor circuit composition.

[0030] The sampling process includes:

[0031] An analog signal conditioning step, adjusting the collected analog signal to an amplitude range suitable for the normal operation of the analog-to-digital converter, and transmitting the analog signal to the analog-to-digital converter;

[0032] The analog-to-digital conversion step receives the analog signal, converts the analog signal into a digital signal, and sets the transmission mode between the digital signal and the microprocessor;

[0033] A digital signal transmission step, sending the digital signal to the microprocessor;

[0034] The system sampling control step is to initialize t...

Embodiment 2

[0056] Fig. 1 is a schematic structural diagram of a sampling system for realizing the above-mentioned analog signal sampling method. In this example, 12 channels are taken as an example, wherein the analog signal conditioning circuit part includes 12 analog signal conditioning sub-circuits 1, and only one is drawn in the figure. Conditioning sub-circuit 1 of the analog channel. Analog signal sub-conditioning circuit 1 comprises: input signal overload protection circuit 11, signal low-pass filter circuit 12, signal proportional amplifier circuit 13, output signal overload protection circuit 14; reference potential generator circuit 6, produces reference potential Vref; modulus The conversion circuit 2 includes an analog interface circuit 21, a 16-bit Σ / Δ analog-to-digital converter 22 and a digital interface circuit 23, each analog channel corresponds to an analog interface circuit 21, and each analog interface circuit corresponds to a 16-bit Σ / Δ Analog-to-digital converters, ...

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Abstract

A method for sampling multichannel analog signal includes using an individual circuit and applying differential signal form inputted by balanced mode to transmit analog signal in each channel, receiving differential signal by multiple channel interfaces in parallel mode simultaneously and carrying out A / D conversion simultaneously, applying over sampling mode in A / D conversion, using high speed serial communication mode to carry out data exchange between A / D converted digital signal to microprocessor, applying serial interface to carry out system initialization and program controlled command transmission.

Description

technical field [0001] The invention relates to a high-speed data acquisition method and system, in particular to a multi-channel analog signal sampling method and system for electronic instruments or equipment. Background technique [0002] The analog signal acquisition system of general electronic instruments or equipment includes analog signal conditioning circuit, analog signal transmission circuit, analog / digital conversion circuit, digital signal communication circuit and sampling control processing device. signal, the anti-common-mode interference ability is poor; multiple channels of the analog / digital converter share one channel, when multi-channel synchronous sampling is required, the signals of each channel must be stored by the sample holder first, and then switched in sequence with the analog electronic switch to realize the separation Time conversion, the sampling speed is not high; A / D converters mostly adopt the principle of bit-by-bit comparison method, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/05
Inventor 张金贵
Owner 张金贵
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