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

Abstract

The invention discloses a multi-path signal unipolar orthogonal 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 orthogonal square waves, 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; a microprocessor processes the digital signal to demodulate out each measured signal. The multi-path signal unipolar orthogonal 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 single-polarity orthogonal 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 introduc...

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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

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