I am currently trying to create a circuit which will convert a 75 ohm Green RGB line with sync (sync on Green) to just Green. I will attach a very basic diagram. My question is will the latency cause me any problems. As you can see one Gs line goes straight to the subtracter and one line has to go through a sync stripper and op amp. Will the two lines be in sync so the "sync" line can be subtracted from the Gs line to create an G signal?
I have found a better way which let's me strip the sync from an RGB signal using two op-amps. One as a comparator which feeds into the other one's low rail to limit it's output. Look for OPA698. Better way to do it. Also to get the sync, split the signal and send it to a sync stripper like a LM1881 to extract sync information.