Abnormal Analysis of Parameters and Research on Influence of Coatingsin I/F Conversion Circuits
Based on the analysis of the working principle of the circuit,we focused on the impact analysis of AD8638 de-vice performance,simulated switch leakage,residual flux,internal water vapor,film-forming substrate,and pin insulation on the problems of zero bias and linearity anomalies discovered during high-temperature testing of I/F conversion circuits,fi-nally,clarified that the fault phenomenon was caused by the deposition of insulation resistance on the surface coating of the insulator at high temperature.The surface of relevant pins glass insulators of faulty circuit occurred coating accumulation,and the insulation performance of the coating decreased at high temperature,which was the reason of causing circuit zero bi-as and linearity anomalies,and the insulation resistance measured values were identical with theoretical calculating values at high temperature test conditions.When the temperature continued to rise,the solvent molecules began to volatilize from the coatings,and the insulation performance and insulation resistance of the coating increased gradually until the circuit parame-ters returned to normal.By conducting experimental research on the influence of 823 coating on electrical parameters,the inherent mechanism of circuit failure was obtained,and product disposal measures and subsequent improvement measures were determined.
zero bias and linearity abnormityhigh temperature testing823 coatingglass insulatorsinsulation resist-ancemechanism analysis
万方数据
维普
