The Study And Implementation Of Programmable Sampling Rate Acquisition Technology Based On Δ-ΣADC

Flight vehicle require a lot of ground tests in the development and shaping process, thereare dozens or even hundreds of environment and status parameters need to be tested in thecourse of the trial. For processing multiple types of signal, in this paper, a multi-channel,programmable sampling rate data acquisition and storage technology based on Δ-ΣADC hasbeen researched. The design achieved16-channels programmable sampling rates, amulti-parameter acquisition, encoding and local storage. Real-time data is uploaded to thedata synthesizer by high-speed bus, data synthesizer upload the decoded data to the computerby USB bus interface, then analyzed and processed the decoded data.This paper introduces the basic theory of data acquisition systems and Δ-ΣADC, andthen the overall design that achieved a programmable sampling rates, multi-channelacquisition is proposed, a detailed analysis of the design of key technologies involved and theways to solve, and then described in detail hardware design and FPGA logic control design,the hardware circuit includ conditioning circuit, an analog/digital conversion circuit, amemory circuit and a control circuit. The design uses a new high-precision Δ-ΣADC as thekey analog-digital conversion, thus improving the overall accuracy of the acquisition; withprogrammable logic device FPGA that own rich I/O resources and powerful logic controlability to control the entire card; Flash is used as the medium for storation. Finally, the criticalhardware and overall performance of the test, and the test results were analyzed.Test results show that the system meets the mission requirements, high precision, smallsize, simple operation, reached the specified performance targets.