I have the following simple op-amp circuit, which is meant to drive a MOSFET (M1) gate and work as a voltage regulator. It is discrete for a mix of reasons (necessary bandwidth, using existing BOM items, avoidance of proprietary parts, cost).
If there is neither RE nor CC present, the circuit can become unstable if the MOSFET is rather beefy (gate capacitance of about 500 pF or more) and if the output load does not damp the resonances well enough.
I found that there are two effective ways to stabilize the circuit: lowering open-loop gain via RE or lowering GBW product via CC. I wonder which is a better way and why?
Intuitively, I am drawn towards RE, because that does not increase the quiescent current to meet target GBW of ~20 MHz. But I guess CC is popular for some good reasons...