What is characteristic of an emitter follower (or common collector) amplifier?
Low input impedance and phase inversion from input to output
Differential inputs and single output
Acts as an OR circuit if one input is grounded
Input and output signals in-phase✓Bonne réponse
Explication
In an emitter follower the emitter voltage tracks the base voltage, so the output is in phase with the input. Voltage gain is slightly less than one; the stage is used for its high input impedance and low output impedance, that is, as a buffer.