You wouldn't even need to do that; you can just drop the gain by say 1/4 or so immediately in software and get ready for another interrupt. If the gain is still above the analog comparator level you'll soon get another interrupt and soon drop the gain another 1/4. The microcontroller side response would be effectively instantaneous assuming no-one disables interrupts. Analog comparator interrupts are good for hacks like that.
Once it's not triggering the comparator anymore you can take your time bringing the AGC back up.
On Wed, 24 Apr 2019 at 11:32, Hasan Murtaza <hasmanean@...> wrote:
Oh for a fast attack, you probably want to use an analog comparator (some microcontrollers have them) that triggers an interrrupt, which switches a mosfet on to either shunt in a low values resistor or something until the AGC loop filter has time to decide how much gain is needed.?
