In this video, the design and working of BJT- differential amplifier is explained.

By watching this video, you will learn the following topics:
0:00 Introduction
0:51 Advantages of Differential Amplifier
3:00 BJT- Differential Amplifier circuit
4:18 DC analysis of Differential Amplifier
6:21 Response of Differential Amplifier to Common Mode input signal (Qualitative Analysis)
9:00 Response of Differential Amplifier to Differential Input signal (Qualitative Analysis)

What is a Differential Amplifier:
A differential amplifier amplifies the difference between the two input signals. It is widely used in the integrated circuits as an amplifier.
The first stage of the op-amp is also a differential amplifier.

In a bipolar differential pair, two perfectly matched BJTs are used.
In the integrated circuits, it is possible to match the characteristics of the two BJTs to some extent.

Advantages of Differential Amplifier:
1) The ideal differential amplifier eliminates the common-mode signal at the output and only amplifies the differential input. Using the differential amplifier it is possible to eliminate or reduce any noise or interference which is common to both input terminals.

2) When multiple differential amplifier stages are cascaded together, then it also eliminates the use of coupling capacitors between each stage.

In this video, the bipolar differential amplifier circuit is discussed and using qualitative analysis, the response of the bipolar differential amplifier to the common-mode input and the differential input signal is discussed.

The link for other useful videos related to BJT (Playlist):
   • BJT (Bipolar Junction Transistor)  

The link for the solved examples on BJT:
   • Bipolar Junction Transistor (BJT) Que...  

This video will be helpful to all the students of science and engineering in understanding what is the differential amplifier and how it can be designed using the BJT.

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