Hi,
I've looked at the "TI Design" - TIDA-00080- Shunt-Based AC/DC Current and Voltage Sensing for Smart Grid Applications with Reinforced Isolation
In the proposed schematic between AMC1304M25 (U5-U10) and TMS320F28377D on the Filter Module board is used active filter at OPA211. I slightly puzzle, as I was sure, that digital filter provided by TMS320F28337 should be enough.
I understand when we use such filter before modulator (AMC1304) but what reason to use it whith "digital" signal.
Could anyone explain why we need additional filter after comparator?