[dragontamer]

https://www.digikey.com/en/products/detail/analog-devices-in...

Looks like they're closer to $3+? Like this is more expensive than a lot of microcontrollers for just one OpAmp.

I wouldn't call any Analog Devices / Linear Technologies parts to be a jellybean. Jellybean means matching common specs that any manufacturer can do.

But at $3 per chip, that's very far away from jellybean status. And AD / LT devices are known for high quality that no one else replicates.

> although THD is getting a little rough up there

Yeah, because a 100MHz high speed OpAmps only has 5x gain at 20MHz. So your error is now well in excess of like 20% (best case) or probably way way worse errors in practice.

As I said earlier: Im not even convinced that 100MHz OpAmps have the GBWP to effectively operate on 20MHz signals. You need more GBWP than that to be comfortable.