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| A Nonlinear Error Correction Method for ADC Based High-precision Resistance Thermometry Readout |
| DING Jiong,WANG Jia-yin,WANG Xiao-na,XU Qi-yue,YANG Sui-jun,FU Shu-fang,YE Shu-liang |
| Institute of Industry and Trade Measurement Technology, China Jiliang University, Hangzhou, Zhejiang 310018, China |
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Abstract Due to the complexity of the circuit architecture, high integration and diversity of nonlinear error sources in ADC based resistance thermometry readout, the effect of the existing nonlinear error correction method is not significant. Aiming at these shortcomings, a novel nonlinear error correction method based on the error sources analysis was proposed for ADC based readout. In the method, the influences of the common-mode rejection ratio, the mismatch of the forward and reverse exciting current were analyzed in mathematically. With the resistance bridge calibrator, these two errors were estimated and corrected, Then the residuals were fitted by the linear polynomial. To verify the effect of the proposed correction method, an ADC-based resistance thermometry readout and a resistance bridge calibrators were developed in the study. The experimental results showed that after the correction of the proposed method, the maximum nonlinear error of the readout is -1.77×10-5, while with the correction of the traditional method, the maximum nonlinear error is -3.57×10-5. The circuit schematics and measurement procedures of the ADC based thermometry readout were released, this is helpful for the countrys the ADC based high-precision resistance thermometry readout development and commercialized.
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Received: 17 July 2018
Published: 19 December 2019
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2020, Vol. 41 
