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多通道SAR型數(shù)字變換器的設(shè)計與實現(xiàn)
2021年電子技術(shù)應(yīng)用第6期
李建翔1,,2,,楊玉華1,2,,劉東海1,2,,李秋媛1,,2
中北大學(xué) 儀器科學(xué)與動態(tài)測試教育部重點實驗室,山西 太原030051,; 2.中北大學(xué) 電子測試國家重點實驗室,,山西 太原030051
摘要: 針對某項目多通道數(shù)字變換器的設(shè)計,提出了一種高可靠性,、高精度的模數(shù)轉(zhuǎn)換方案,。為完成12路傳感器信號的采集、4路電壓電流的采集,,對硬件電路進(jìn)行了詳細(xì)的分析與優(yōu)化,。待采集信號先后通過信號調(diào)理、模擬開關(guān),、分壓跟隨以及抗混疊濾波對其進(jìn)行處理,,并對鏈路的建立時間進(jìn)行分析,最后采用逐次逼近型AD芯片進(jìn)行轉(zhuǎn)換,,通過與上位機(jī)配合驗證數(shù)據(jù)的采集精度,。經(jīng)過大量實驗數(shù)據(jù)驗證,采集精度均能優(yōu)于0.5%,,達(dá)到任務(wù)要求,。
中圖分類號: TN911.71
文獻(xiàn)標(biāo)識碼: A
DOI:10.16157/j.issn.0258-7998.200979
中文引用格式: 李建翔,楊玉華,劉東海,,等. 多通道SAR型數(shù)字變換器的設(shè)計與實現(xiàn)[J].電子技術(shù)應(yīng)用,,2021,47(6):105-109,,114.
英文引用格式: Li Jianxiang,,Yang Yuhua,Liu Donghai,,et al. Design and analysis of multi-channel SAR digital converter[J]. Application of Electronic Technique,,2021,47(6):105-109,,114.
Design and analysis of multi-channel SAR digital converter
Li Jianxiang1,,2,Yang Yuhua1,,2,,Liu Donghai1,2,,Li Qiuyuan1,,2
1.Key Laboratory of Instrumentation Science and Dynamic Measurement of Ministry of Education,North University of China,, Taiyuan 030051,,China; 2.National Key Laboratory for Electronic Measurement Technology,,North University of China,,Taiyuan 030051,China
Abstract: In this paper, a high-reliability and high-precision analog-to-digital conversion scheme is proposed for the design of a multi-channel digital converter in a project. In order to complete the collection of 12 channels of sensor signal and the collection of 4 channels of voltage and current, the hardware circuit is analyzed and optimized in detail. The signal to be collected is processed by signal conditioning, analog switch, voltage division follow-up and anti-aliasing filtering, and the establishment time of the link is analyzed. Finally, the successive approximation AD chip is used for conversion. Verification of data collection accuracy through cooperation with the host computer.After a lot of experimental data verification, the collection accuracy can be better than 0.5%, meeting the task requirements.
Key words : analog-to-digital conversion,;high precision acquisition,;signal conditioning;analog switch,;anti-aliasing filtering

0 引言

    伴隨著當(dāng)今電子技術(shù)的迅猛發(fā)展,,集數(shù)據(jù)的采集、傳輸以及存儲功能為一體的設(shè)備體積越來越小,,被廣泛應(yīng)用于各種測試實驗當(dāng)中,,由于測試測量任務(wù)中參數(shù)眾多,而且對每一個指標(biāo)的要求各不相同,,細(xì)微的環(huán)境影響就可能導(dǎo)致采集結(jié)果的誤差增加,,因此對數(shù)據(jù)的采集提出越來越高的要求[1]

    數(shù)字變換器是將采集到的模擬量信號進(jìn)行量化處理,,將多種轉(zhuǎn)換后的數(shù)字量信號進(jìn)行打包編幀,,通過RS422接口將數(shù)據(jù)傳輸?shù)缴衔粰C(jī)進(jìn)行校驗。本次設(shè)計中對多路傳感器信號、電壓信號,、電流信號進(jìn)行采集,,重點從電路的設(shè)計方面對其進(jìn)行優(yōu)化,并對其進(jìn)行了詳細(xì)的性能測試,,相較于傳統(tǒng)的測試系統(tǒng),,采集的信號精度更高,更加穩(wěn)定可靠,。




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作者信息:

李建翔1,2,,楊玉華1,,2,劉東海1,,2,,李秋媛1,2

(中北大學(xué) 儀器科學(xué)與動態(tài)測試教育部重點實驗室,,山西 太原030051,;

2.中北大學(xué) 電子測試國家重點實驗室,山西 太原030051)




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