How to analyse the circuit below when M3 is connected from Vout to Vin ? Will that affect the Vout ? How Vout vs Vin curve looks like ?
M1,M2 and M3 are identical.
As shown won't bias easily for same Vgs and give high gain.
Probably saturated. ( ie. a big non-linear attenuator) since large output switch will saturate input, so all 3 will not be in linear range, unless very low Vgs.
I'm tempted to suggest you perform an AC and Transient analysis at some online simulator; the circuit is quite simple. Anyway, in adding some components close to M3, I would dare to say that could work as an AGC circuit, just a guess