5 Conclusion

For ≥100μV/A Rogowski coils, the external gain stage is not necessary, resulting in a reduced cost for an energy metering signal-chain solution. For <100μV/A Rogowski coils, external gain may be needed to meet residential electricity metering accuracy when using the TI ADS131M08 or a comparable ADC. Or alternatively, a lower-noise, higher cost ADC may be considered to avoid the additional circuitry.