BJT Large Signal Model Explained

In this video, the large-signal model of the BJT has been explained.

By watching this video, you will learn the following topics:

0:31 Why we need transistor model
3:03 BJT Large Signal Model
6:40 Approximation used during the DC analysis of the BJT

The transistor model :
The transistor model is the equivalent representation of the BJT which closely represents the transistor characteristics. This model is based on the familiar circuit elements like a voltage source, current source, resistor, diode, etc. And using this model the analysis of the circuit becomes easier.

Based on the magnitude of the input signal, there are two transistor models.
1) The large-signal model
2) The small-signal model

As its name suggests, when the input signal to the BJT is large, the large-signal model is used.
The large signal could be AC or DC signal.
But in the common-emitter configuration, when the BJT is used as voltage amplifier, the large signal is often referred to the DC signal.

The BJT is a non-linear device, and in the large-signal model, all the non-linearities in the BJT is taken into account.
The large-signal model which is discussed in the video is applicable only when the BJT is operating in the forward active region.

This video will be helpful to all the students of science and engineering in understanding the large-signal model of the BJT.

#BJT
#BJTLargeSignalModel
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