SBOA597 November   2024 OPA928

1.   1
2.   Abstract
3.   Trademarks
4. 1Introduction
5. 2Architecture of Small Current Measurement
   1. 2.1 Coulombmeter
   2. 2.2 Using the Coulombmeter to Determine IB
   3. 2.3 Leakage of Integration Capacitor
6. 3Benchmarking
   1. 3.1 Point to Point Wiring
   2. 3.2 Shielding
   3. 3.3 PCB Cleaning
   4. 3.4 Temperature Stability
7. 4Calibration Using a Coulombmeter for Application Circuits
   1. 4.1 Calibration of Common Application Circuits
   2. 4.2 Calibration of Inverting Input
   3. 4.3 Calibration of Non-Inverting Input
   4. 4.4 Determine Resistance of the Capacitor Using Zero-Cross Method
   5. 4.5 Dielectric Absorption and Relaxation
   6. 4.6 Calibration at 85°C
   7. 4.7 Calibration at 25C
8. 5Summary
9. 6References