In this video, the basic MOS Differential Amplifier has been explained.
By watching this video, you will learn the following topics:
0:00 Introduction
0:40 Advantage of Differential Signaling
3:33 What is Common-mode input signal?
4:25 Basic MOS Differential Pair
8:41 Differential Amplifier with Common-mode input
13:50 Range of Common-mode input for Differential Amplifier
17:13 Differential Amplifier with Differential Input (Qualitative Analysis)
What is a Differential Amplifier:
A differential amplifier amplifies the difference between the two input signals. It is widely used in integrated circuits as an amplifier.
The first stage of the op-amp is also a differential amplifier.
In a MOS differential pair, two perfectly matched MOSFETs with identical characteristics are used.
In the integrated circuits, it is possible to match the characteristics of the two MOSFETs 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.
This video will be helpful to all the students of science and engineering in understanding the basics of the MOS Differential Pair.
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