Op Amp Block Diagram | Operational Amplifier

Hey, let's see and understand Op Amp Block Diagram in detail explanation. From the block diagram of Op Amp, you will get sufficient knowledge. It is good to start learning everything from the basic. So in this article, we are going to know the basics of Op Amp using its block diagram. We already have a detailed article on Operational Amplifier. So if you want to know more about Op Amp then you can read that article. The link is given at the end of this article.

Op Amp Block Diagram

Here the block diagram of OpAMP(Operational Amplifier) is given below. In the below diagram, the biasing terminals and the name of each block are given.

The above block diagram illustrates the various functional blocks or stages within the OpAmp, providing a high-level overview of its internal components and how they interact. It typically includes elements such as differential amplifiers, gain stages, compensation networks, and output buffers. Understanding these functional blocks helps you grasp the overall operation and purpose of the OpAmp. This block diagram also helps you trace the path of the input and output signals through the OpAmp's internal stages. It shows how the signals are processed, amplified, and shaped as they pass through different components. This analysis is valuable for understanding the amplification, filtering, and other signal manipulation capabilities of the OpAmp.

Explanation of the Block Diagram of Op Amp

Now let's discuss each block and how they work. A simplified block diagram with some additional information is given below.

As you see in the above figure there are four blocks.

Input Stage: The main function of Op Amp is, at first it creates a difference between the two input signals and then amplifies the differentiated signal. So in the Input Stage, the differential amplifier creates the differences. In this stage, the differential amplifier also provides the high input impedance which is necessary for the operational amplifier. You can see in this stage the dual input balanced output differential amplifier is used which increases the voltage for the next stage of operation.

Intermediate Stage: The output of the input stage is used as the input of the Intermediate Stage.  In this stage, the direct coupling happens. So, in this stage, the DC voltage is greater than the ground potential or 0V.

Level Shifting Stage: As in this stage the shifting of voltage level happens that is why it is called Level Shifting Stage. Here the emitter follower with a constant current source is applied.

Output Stage: In this stage, the push-pull amplifier is used. The output of the level-shifting stage is given to the input of the push-pull amplifier. The push-pull amplifier increases the output voltage and high current-delivering capability of the operational amplifier.

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