Active Integrator for Rogowski Coil Reference Design with Improved Accuracy for Relay and Breaker


Design files


This reference design shows an active integrator design that covers wide-input current range for Rogowski Coil with accuracy, linearity, stability and repeatability. The integrator uses a precision amplifier with very-low offset and temperature drift. Two configurations of the integrator are shown. One is for precision measurement with less than 3O-phase error and the other is for fast response time (< 15-ms RC). While the output signal is bipolar, optional level shifting stage can be used when unipolar output is required.

  • Active integrator design using low offset and close to zero drift amplifier (OPA2188)
  • Integrator output compatible with unipolar or bipolar ADC input range (Example: ADS131A04 with 0-5-V or ±2.5-V input)
  • Integrator has been tested for accuracy at 50/60 Hz, repeatability and temperature stability over 25°C ± 35°C
  • The integrator operates from a single 5-V DC input with positive and negative voltages for bipolar operation generated on board.
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRMR2.ZIP (1854 K)

Files used for 3D models or 2D drawings of IC components

TIDCCF0.ZIP (2290 K)

Design file that contains information on physical board layer of design PCB

TIDRMR1.PDF (1974 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Precision op amps (Vos<1mV)

OPA188Precision, Low-Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA21880.03µV/°C, 6µV Vos, Low Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA2189Dual, 14-MHz, MUX-friendly, low-noise, zero-drift, RRO, CMOS precision operational amplifier

Data sheet: PDF | HTML
Charge pumps (inductorless)

TPS6040360mA Charge Pump Voltage Inverter with Fixed 250kHz Operation

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

LP2951-N100-mA, 30-V, low-dropout voltage regulator with power good & enable

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS723200-mA, negative, adjustable low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Shunt voltage references

LM4040-N100-ppm/°C precision micropower shunt voltage reference

Data sheet: PDF

Start development

Design tools & simulation

Simulation model

TIDA-00777 Simulation File (Precision Measurement) — TIDM041.ZIP (128 K)

Simulation model

TIDA-00777 Simulation File (Protection) — TIDM040.ZIP (130 K)

Technical documentation

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Type Title Date
* Design guide Active Integrator Rogowski Coil for Relay and Breaker Design Guide (Rev. A) Sep. 29, 2016

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

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