Question
What is characteristic of an emitter follower (or common collector) amplifier?
Answer Options
- A) Low input impedance and phase inversion from input to output
- B) Differential inputs and single output
- C) Acts as an OR circuit if one input is grounded
- D) Input and output signals in-phase
Correct Answer: D
Explanation
The emitter follower, also known as the common collector, is a specific BJT amplifier configuration where the input is applied to the base, and the output is taken from the emitter. This configuration is characterized by a high input impedance and a low output impedance, making it a nearly ideal buffer stage.
A key characteristic of the emitter follower is that the signal passing from the input (base) to the output (emitter) is not inverted; rather, the input and output signals are in-phase. This is a non-inverting amplifier configuration, typically used to provide voltage gain close to unity while successfully isolating the source from the load and providing necessary impedance transformation.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!