SDAA566 October   2026

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Working Principles
    1. 2.1 Electromagnetic Induction
    2. 2.2 Mathematical Model and Sensitivity
    3. 2.3 Phase Shift: 90° Offset
  6. 3Design Challenges and Workarounds
    1. 3.1 Low Signal Amplitude (μV/A)
    2. 3.2 Sensitivity to Noise
    3. 3.3 Effect of Artificial Load
    4. 3.4 Integration needed
      1. 3.4.1 Integration Theory
      2. 3.4.2 Choosing Integration Frequency: Phase and Gain Margin Versus Number of Decades
    5. 3.5 Stray Magnetic Fields Interference
    6. 3.6 Crosstalk
    7. 3.7 Mechanical Considerations
    8. 3.8 Errors From Non-Ideal Coil Design
  7. 4Summary
  8. 5References

Abstract

This application note is one of a three-piece series about using PCB Rogowski coils for current sensing applications. This application note provides a detailed explanation of the operating principles of Rogowski coil current sensor. Additionally, the document explains the unique design challenges associated with PCB-based Rogowski coils and presents optimized design methodologies to overcome these challenges.