Multi-path data acquiring system based on FPGA

Abstract

The invention discloses a multi-path data acquiring system based on FPGA, which mainly solves the problems of small signal acquiring range and poor acquiring precision of the prior multi-path acquiring system. The multi-path data acquiring system comprises a multi-path selector, a programmable-gain amplifier, an AD converter and an FPGA data processing module, wherein the FPGA data processing module sends an address signal to the multi-path selector and also sends a magnification signal to the programmable-gain amplifier; the multi-path selector selects an external analog signal according to the address signal to enter the programmable-gain amplifier; after amplifying the input analog signal, the programmable-gain amplifier outputs the analog signal to the AD converter; the AD converter samples the input analog signal, quantifies the analog signal to form a digital signal and transmits the digital signal to the FPGA data processing module; and the FPGA data processing module transmits the input data to a host computer after sequencing, wave filtering and table searching. The invention has the advantages of wide signal acquisition range, high precision can convenient acquisition path expansion, thereby being suitable for the signal acquisition of an industrial monitoring and sensing network.

Description

technical field [0001] The invention belongs to the field of electronic circuits and relates to a multi-channel data acquisition system, which is used in multiple fields such as industrial monitoring and sensor networks. Background technique [0002] The multi-channel data acquisition system is used to track multiple target objects, collect the characteristic parameters of the target objects, and convert the parameters into digital signals and send them to the host computer. [0003] Most of the existing multi-channel data acquisition systems simply use AD converters to convert analog signals into digital signals without considering the accuracy of the system, such as "a multi-channel data acquisition system" mentioned in the patent No. "Mainly made improvements in the integration and miniaturization of the system, without considering the accuracy of the system; another example is the "multi-channel data acquisition system" mentioned in the patent No. 200820095724.9, after t...

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Problems solved by technology

[0003] Most of the existing multi-channel data acquisition systems simply use AD converters to convert analog signals into digital signals without considering the accuracy of the system, such as "a multi-channel data acquisition system" mentioned in the patent No. "Mainly made improvements in the integration and miniaturization of the system, without considering the accuracy of the system; another example is the "multi-channel data acquisition system" mentioned in the patent No. 200820095724.9, after the multiplexer Connect an amplifier with a fixed magnification, then output to the AD converter, and finally average the signal sampling data in the microprocessor, so as to realize multi-channel data acquisition. Although the above technology considers the accuracy of the system, there are The following technical bottlenecks: (1) Amplify the analog signal with a fixed coefficient, and the signal acquisition range is small; (2) The filtering effect of simple average processing is not obvious, and the accuracy will drop sharply in harsh environments

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