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Single-path synchronous collection device for multi-path unipolar quadrature square wave modulation signal rising level

An orthogonal square wave and synchronous acquisition technology, applied in the field of signal measurement, can solve the problems of low signal-to-noise ratio of digital signals and affect the accuracy of signal acquisition, and achieve the effect of improving signal-to-noise ratio and accuracy

Inactive Publication Date: 2017-03-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, when the unipolar orthogonal square wave is used as the excitation signal, the signal-to-noise ratio of the digital signal obtained in the low-level part of the unipolar orthogonal square wave is very low, thereby affecting the acquisition accuracy of the signal

Method used

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  • Single-path synchronous collection device for multi-path unipolar quadrature square wave modulation signal rising level
  • Single-path synchronous collection device for multi-path unipolar quadrature square wave modulation signal rising level
  • Single-path synchronous collection device for multi-path unipolar quadrature square wave modulation signal rising level

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Embodiment 1

[0030] A single-channel synchronous acquisition device for multi-channel elevated level unipolar quadrature square wave modulation signals, 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,

[0031] The microprocessor 4 outputs a unipolar quadrature square wave with different frequencies and a ratio of 2 times to raise the preset level, and the unipolar quadrature square wave controls the on-off of at least two switch circuits 1, N(N >=2) The measured signal passes through the switch circuit 1 (the switch circuit 1 is composed of a resistor and an analog switch), and the switch circuit 1 is used to realize chopping and amplitude modulation. The amplitude-modulated signals of different frequencies are added by the addition operation circuit 2, and after adding a preset DC level, the single-channel analog-to-digital conv...

Embodiment 2

[0038] A software method for a single-channel synchronous acquisition device for multi-channel raised level unipolar quadrature square wave modulation signals, see figure 2 and image 3 , the method includes the following steps:

[0039] 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;

[0040] 102: The microprocessor processes the digital signal, and demodulates each measured signal.

[0041] For the sake of simplicity, take the unipolar quadrature square wave drive switch circuit 2 with 4 frequencies and raise the preset level as an example, and collect 4 measured signals as an example. Assume that the measured signal V 1 , V 2 , V 3 and V 4 The frequency of the unipolar quadrature square wave corresponding to the driving of the switch circuit 1 to raise the preset level is 2f, 2f, f, f respectively, and V 1 , V 2 The phase difference of the driving square wave corresponding...

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Abstract

The invention discloses a single-path synchronous collection device for a multi-path unipolar quadrature square wave modulation signal raising a level. The unipolar quadrature square wave raising the preset level controls on and off of at least two switch circuits, and the switch circuits achieve chopping modulation; the modulated signals with different frequency are added by an additive operation circuit, and then are subjected to analog-digital conversion by a single-path analog-digital converter to acquire a digital signal; as the unipolar quadrature square wave modulation signal serving as a drive raises the preset level, noise is significantly improved at a low level portion of the unipolar quadrature square wave modulation signal, so that a signal to noise ratio of the single-path analog-digital converter which acquires the digital signal by performing analog-digital conversion, at the low level section of the unipolar quadrature square wave modulation signal is improved, and thus accuracy of the digital signal input into a microprocessor is improved; and the microprocessor processes the digital signal to demodulate each signal under test. According to the device provided by the invention, the multi-path signal under test is synchronously collected via the analog-digital converter.

Description

technical field [0001] The invention relates to the field of signal measurement, in particular to a single-channel synchronous acquisition device for multi-channel elevated level unipolar quadrature square wave modulation signals. 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] In the existing multi-channel signal acquisition system, it is usually necessary to use a multi-chip ADC or a multi-channel analog switch with a single-chip ADC. The former has the disadvantages of complex circuits, high system power consumption and large circuit size; In the process, due to the switching of the multi-way switch, switching noise is int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
CPCH03M1/126H03M1/123
Inventor 李刚杨悦林凌
Owner TIANJIN UNIV
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