Bipolar orthogonal square wave modulated one-way synchronous acquiring device and bipolar orthogonal square wave modulated one-way synchronous acquiring method for multiple channels of signals

Abstract

The invention discloses a bipolar orthogonal square wave modulated one-way synchronous acquiring device and a bipolar orthogonal square wave modulated one-way synchronous acquiring method for multiple channels of signals. The acquiring device acquires N channels of signals via an analog-to-digital converter; orthogonal square waves control switching-on and switching-off of at least two switch circuits; at least two channels of measured signals pass through a switch circuit; the switch circuit consists of an analog switch, a resistor and an operational amplifier; bipolar orthogonal square wave amplitude modulation is implemented via the switch circuit; after the amplitude of signals is modulated, the signals with different frequencies are added together via an additive operation circuit; and the one-way analog-to-digital converter performs analog-to-digital conversion to obtain digital signals. Multiple channels of measured signals can be acquired synchronously by the one-way analog-to-digital converter. The bipolar orthogonal square wave modulated one-way synchronous acquiring device has the advantages of simple circuits, low cost and high measurement accuracy.

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 quadrature 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 switch...

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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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