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What is the output impedance of emitter follower?
The input impedance of the emitter follower is found as the parallel equivalent resistance of the base resistors and the transistor input impedance. The output impedance is the impedance that the circuit presents to its load.
How do you find the impedance of an emitter follower?
Output Impedance: if removing Re and Rc, Zout = 2Mohm/(100+1). With Rb and Rc in place, according to AoE formula, Z_source = 2Mohm/(100+1) + 10kohm + 1kohm = 30,801.980198 ohm (the resistance looking into emitter in the perspective of the load, or R_e).
What are the application of emitter follower?
The emitter follower configuration is mostly used as a voltage buffer. These configurations are widely used in impedance matching applications because of their high input impedance. Common collector amplifiers have the following circuit configurations.
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 use of emitter follower?
In electronics, a common collector amplifier (also known as an emitter follower) is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies, typically used as a voltage buffer.
What are emitter follower configurations?
An emitter follower is one of the standard transistor configurations which is also referred to as common collector transistor configuration. Let’s try to first understand what’s an emitter follower transisto r and why it’s called a common collector transistor circuit.