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Single-channel synchronous acquisition device and method for multi-channel signal bipolar square wave modulation

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

Inactive Publication Date: 2018-05-08
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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  • Single-channel synchronous acquisition device and method for multi-channel signal bipolar square wave modulation
  • Single-channel synchronous acquisition device and method for multi-channel signal bipolar square wave modulation
  • Single-channel synchronous acquisition device and method for multi-channel signal bipolar square wave modulation

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Embodiment 1

[0024] A single-channel synchronous acquisition device for multi-channel signal bipolar 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, analog switches and operational amplifiers), the switch circuit 1 is used to realize bipolar square wave 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 ...

Embodiment 2

[0028] A single-channel synchronous acquisition method for multi-channel signal bipolar square wave modulation, see figure 2 , 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 4;

[0030] 102: The microprocessor 4 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 ensure that the measured signal V 1 High and low level intermediate sampling.

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

[0034] ...

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Abstract

The invention discloses a single-channel synchronous acquisition device and method for multi-channel signal bipolar square wave modulation. The acquisition device collects N-channel signals through one channel of analog-to-digital converter, and specifically includes: square wave control at least two channels of switch circuits On / off, at least two signals to be tested pass through a switch circuit, which is composed of an analog switch, a resistor and an operational amplifier. The switch circuit realizes bipolar square wave amplitude modulation; the amplitude-modulated signals of different frequencies are After the addition operation circuit is added, the digital signal is obtained by the analog-to-digital conversion by the single-channel analog-to-digital converter; the invention realizes the synchronous acquisition of the multi-channel measured signals through the single-channel analog-to-digital converter, and has the advantages of simple circuit and low cost. and accurate measurements.

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 bipolar 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 d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12G01R19/25
Inventor 李刚易小清林凌宋韶秀
Owner TIANJIN UNIV
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