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Which BJT configuration is known as emitter follower?
common-collector amplifier
The common-collector amplifier is also known as an emitter-follower. The output voltage on a common-collector amplifier will be in phase with the input voltage, making the common-collector a non-inverting amplifier circuit.
Is emitter a follower?
The emitter follower (Figure 5.11(a)) is a buffer stage with high input impedance, low output impedance, and a gain of approximately unity. Using the small-signal low-frequency circuit of Figure 5.11(b), we will find the gain, input resistance seen at the base, and output resistance seen at the emitter.
What is emitter follower used for?
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.
When is an emitter-follower used in a BJT circuit?
In a BJT configuration when the emitter terminal is used as the output, the network is called an emitter-follower. In this configuration the output voltage is always a shade lower than the input base signal due to the inherent base to emitter drop. In simple terms, in this type of transistor circuit the emitter seems to be following
What kind of transistor has an emitter follower?
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.
Which is a problem of the simple emitter follower?
A problem suffered by the simple emitter follower can be seen when it drives a capacitive load. The rise time of the output can be relative fast as the emitter current is limited only by beta times the base current that can be supplied by the signal source driving the base.
How is the NPN emitter follower amplifier connected?
To investigate the simple NPN emitter follower amplifier also sometimes referred to as the common collector configuration. The breadboard connections are shown in the diagram below. The output of the arbitrary waveform generator, W1, is connected to the base terminal of Q 1.