Comparison and Improvement with the Capacity of C/R Measurement Method of fA Level Current
Zhaoyi Zhang · Electrical Measurement & Instrumentation · 2011
Through the comparative analysis of capacitor-integration and transimpedance measurement method of weak current,the paper can conclude that capacitor-integration method is suitable for discontinuous measurement,and transimpedance method is suitable for quickly continuous measurement.Taking transimpedance method for example,viewed from choosing amplifier,anti-aliasing filter and high resolution A/D conversion standpoint,the effect caused by input bias current,noise disturbance,low resolution and ambient on weak current measurement temperature has been solved,and improved the performance of measurement.Finally,it has been successful to measure the continuous variation current of fA level.