- #1
kuchun
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What is an emitter follower? I want to know its working principle with proper circuit diagram..
Analog Electronics: Emitter Follower Working Principle
- Thread starter kuchun
- Start date
In summary, an emitter follower is a type of common collector amplifier that takes its output from the emitter resistor. It has a high input impedance and low output impedance, making it useful for impedance matching and buffering. Its working principle and circuit diagram can be found on various online resources, such as Wikipedia and HyperPhysics. It also has many applications in electronics.
- #2
berkeman
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kuchun said:
As in your other thread, Google and wikipedia are your friends:
http://en.wikipedia.org/wiki/Emitter_follower
.
- #3
dlgoff
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Here is a good place that will be helpful I hope
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/npncc.html"
And some good applications.
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/emitfol.html"
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/npncc.html"
And some good applications.
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/emitfol.html"
Last edited by a moderator:
- #4
dlgoff
Science Advisor
Gold Member
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Berkeman. You're too fast in posting. 
- #5
kuchun
- 11
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Thanx, it was a great link...dlgoff said:Here is a good place that will be helpful I hope
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/npncc.html"
And some good applications.
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/emitfol.html"
Last edited by a moderator:
Related to Analog Electronics: Emitter Follower Working Principle
1. What is an emitter follower in analog electronics?
An emitter follower, also known as a common collector amplifier, is a type of transistor circuit that is used to amplify a signal without changing its polarity. It consists of a transistor with the emitter connected to a load and the base connected to an input signal. The collector is connected to a power supply.
2. How does an emitter follower work?
An emitter follower works by using the transistor to buffer the input signal. The input signal is applied to the base of the transistor, which causes a corresponding change in the current flowing through the emitter. The emitter current then passes through the load and creates an output voltage. The transistor acts as an impedance matching device, allowing the circuit to have a high input impedance and a low output impedance.
3. What are the advantages of using an emitter follower in a circuit?
There are several advantages of using an emitter follower in a circuit. These include high input impedance, low output impedance, and a voltage gain of approximately 1. It also acts as a buffer, preventing the input signal from loading down the source. Additionally, the emitter follower has a high linearity and low distortion, making it useful for applications that require accurate amplification of signals.
4. What are the limitations of using an emitter follower in a circuit?
Despite its advantages, an emitter follower also has some limitations. One limitation is its low voltage gain, which is approximately 1. This means that the output voltage will be nearly equal to the input voltage. Additionally, the emitter follower has a limited output swing, which can affect its ability to amplify large signals. It also has a relatively low bandwidth, making it unsuitable for high-frequency applications.
5. How is an emitter follower different from other types of transistor circuits?
An emitter follower is different from other transistor circuits, such as common emitter and common base configurations, in terms of its input and output characteristics. In a common emitter circuit, the input and output signals have opposite polarities, while in a common base circuit, the input and output signals have the same polarity. In contrast, an emitter follower has the same polarity for both the input and output signals. This allows it to act as a unity gain buffer, making it useful for impedance matching and signal isolation applications.
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