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Where emitter follower is used?
Emitter follower is a negative current feedback circuit. Emitter follower configuration, also known as Common collector, provides high input impedance and low output impedance. So they are used for the purpose of impedance matching.
What do you mean by emitter follower?
Emitter follower low-frequency gain, input impedance, and output impedance. The emitter follower (Figure 5.11(a)) is a buffer stage with high input impedance, low output impedance, and a gain of approximately unity.
Why emitter follower is used in circuits?
The emitter follower is widely used as a buffer amplifier to reduce the loading on the previous stage and provide a lower impedance output for any following circuits. The electronic circuit design for the stage is also very straightforward and easy to accomplish.
What are the applications of an emitter follower?
Applications of Emitter Follower . The emitter follower has the following principal applications : (i) To provide current amplification with no voltage gain. (ii) Impedance matching. (i) Current amplification without voltage gain. We know that an emitter follower is a current amplifier that has no voltage gain (Aν = 1). There are many instances (especially in digital electronics) where an increase in current is required but no increase in voltage is needed.
What is the function of bootstrap emitter follower?
Emitter followers can provide rail-to-rail output in this way, which is a common technique in class AB audio amplifiers. Within an integrated circuit a bootstrap method is used to allow internal address and clock distribution lines to have an increased voltage swing.
What is Darlington emitter follower?
A darlington emitter follower is two transistors operating as one. Both collectors are tied together. Both collectors are tied together. The emitter of the first is connected to the base of the second.