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Multi-path signal unipolar square wave modulated single-path synchronous collection device and method

A synchronous acquisition and multi-channel signal technology, applied in the field of signal measurement, can solve the problems of switching noise, high system power consumption, large circuit size, etc., and achieve the effect of simple circuit, accurate measurement and low cost

Active Publication Date: 2015-07-29
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The inventor found in the process of realizing the present invention that in the existing multi-channel signal acquisition, it is usually necessary to use a multi-chip ADC or a multi-channel analog switch with a single-chip ADC solution. The former has complex circuits, high system power consumption and circuit size. The latter will introduce switching noise due to the switching of multi-channel switches during the acquisition process, and due to the establishment time of multi-channel switches, it will cause mutual interference between adjacent channel signals

Method used

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  • Multi-path signal unipolar square wave modulated single-path synchronous collection device and method
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  • Multi-path signal unipolar square wave modulated single-path synchronous collection device and method

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Embodiment 1

[0024] A single-channel synchronous acquisition device for multi-channel signal unipolar square wave modulation, see figure 1 , the single-channel synchronous acquisition device includes: at least two switch circuits 1, an addition operation circuit 2, a single-channel analog-to-digital converter 3 and a microprocessor 4,

[0025] The microprocessor 4 outputs square waves with different frequencies and a ratio of 2 times. The square waves control the on-off of at least two switch circuits 1, and N (N>=2) measured signals pass through the switch circuit 1 (the switch circuit 1 Composed of resistors and analog switches), the switch circuit 1 is used to realize chopping amplitude modulation. The amplitude modulated signals of different frequencies are added by the addition operation circuit 2, and then converted by the single-channel analog-to-digital converter 3 to obtain a digital signal. The microprocessor 4 processes the digital signals and demodulates each measured signal. ...

Embodiment 2

[0028] A single-channel synchronous acquisition method for multi-channel signal unipolar square wave modulation, see figure 2 and image 3 , the method includes the following steps:

[0029] 101: the mixed signal is converted into a digital signal by the single-channel analog-to-digital converter 3 and sent to the microprocessor 1;

[0030] 102: The microprocessor processes the digital signal, and demodulates each measured signal.

[0031] For the sake of simplicity, take 4 frequency square waves to drive the switch circuit 2 and collect 4 measured signals as an example. Assume that the measured signal V 1 , V 2 , V 3 and V 4 The driving square wave frequencies corresponding to the switching circuit 1 are 8f, 4f, 2f and f respectively.

[0032] Assume that the sampling frequency of the single-channel ADC 3 is f S , and f S =16f, and guaranteed at V 1 Sampling between high and low levels of the signal.

[0033] digital signal sequence It can be expressed as:

[00...

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Abstract

The invention discloses a multi-path signal unipolar square wave modulated single-path synchronous collection device and method. The collection device collects N paths of signals by a single-path analog-digital converter, and specifically comprises that the connection and disconnection of at least two switch circuits are controlled by square waves, at least two paths of measured signals pass through a switch circuit consisting of an analogue switch and a resistor, and the switch circuit achieves chopping amplitude modulation; the signals with different frequencies after amplitude modulation are added by an add operation circuit, and then subjected to the analog-digital conversion of the single-path analog-digital converter to obtain a digital signal; the multi-path signal unipolar square wave modulated single-path synchronous collection device and method achieve that the multi-path measured signals are synchronously collected by the single-path analog-digital converter, and has the characteristics of being simple in circuit, low in cost and accurate in measurement.

Description

technical field [0001] The invention relates to the field of signal measurement, in particular to a single-channel synchronous acquisition device and method for multi-channel signal unipolar square wave modulation. Background technique [0002] The amount of information-carrying changes such as voltage signals is expressed in analog form in its natural state. However, in order to facilitate computer processing, transmission and storage, it is usually converted into a digital signal through an ADC (Analog-to-Digital Converter). Therefore, in signal processing, analog-to-digital conversion is essential. [0003] The inventor found in the process of realizing the present invention that in the existing multi-channel signal acquisition, it is usually necessary to use a multi-chip ADC or a multi-channel analog switch with a single-chip ADC solution. The former has complex circuits, high system power consumption and circuit size. However, the latter will introduce switching noise ...

Claims

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Application Information

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IPC IPC(8): H03M1/12
Inventor 李刚宋韶秀易小清林凌
Owner TIANJIN UNIV
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