One disadvantage is a voltage offset between input and outpur equal to one base-emitter voltage drop. This offset must be accounted for or removed via a transformer or coupling capacitor.
A darlington emitter follower is two transistors operating as one. Both collectors are tied together. The emitter of the first is connected to the base of the second.
The darlington exhibits very...
The emitter follower, or Class C amplifier, is stable because offset does not depend too much on temperature, nor is there a bias circuit that affects gain.
The emitter voltage is about 0.7V less...