Design of Weak Current Measurement with Capacitor-integration Based on STM32
Guiyu Zhang · Electrical Measurement & Instrumentation · 2012
Based on the capacitor-integration measurement method,the STM32 series microcontroller was used to control the dual channel and dual switched integrated chip DDC112.Coordinate with the process design for Anti-leakage current,it realized double channel fA(fei ampere 10A) level of the current weak consecutive measurements.By using a single chip DDC112 to realize I/V switching and providing 20 digital output,the system is with simplified circuit,high resolution,low noise interference characteristics.The system measurement resolution achieves 1fA,measuring time range is 50~1×10μs,and current range can be set up in the range of 5×10~7×10fA by setting the integral time.