Op-Amp: Gain Bandwidth Product and Frequency Response

In this video, the frequency response and the gain bandwidth product of an op-amp have been discussed.
Gain bandwidth product is a very important parameter of the op-amp. And it is quite often used for selecting specific op-amp for the particular application.

Frequency Response of the op-amp:

In open loop configuration, the gain of the op-amp is not constant and varies with the frequency. The gain of the op-amp remains constant up to the certain frequency and beyond that, it reduces at the constant rate of -20 dB/dec.

In open loop configuration, the bandwidth of the op-amp used to be very low (Few Hertz), because most of the today's op-amps are internally compensated. (By using the internal compensation capacitor)

This internal compensation ensures the stability of the op-amp output at high frequency when op-amp is used in the feedback configuration.
And second, it ensures that op-amp has a single cut-off frequency at till its gain reaches the unity gain.

Gain Bandwidth Product of Op-amp:

Because of the internal compensation, it is easy to identify the frequency of the operation if we know the gain of the op-amp. Or it is easy to understand the behavior of the op-amp with frequency.
And the product of gain and frequency remains constant till the unity gain frequency for the op-amp, which is known as the gain bandwidth product of the op-amp.

Gain bandwidth product is very useful when op-amp is used in the closed loop configuration. Using this closed loop configuration, we can find the cut-off frequency of the op-amp using this gain-bandwidth product.

For any op-amp gain bandwidth product = Unity Gain Frequency.

The timestamps for the different topics covered in the video is given below:

0:33 Frequency Response of the Op-Amp
1:25 Role of Internal Compensation Capacitor in the Frequency Response of the Op-amp
2:58 Gain Bandwidth Product of Op-Amp
5:40 Gain Bandwidth Product of Non-Inverting and Inverting Op-Amp


This video will be helpful to all students in understanding the frequency response and the gain-bandwidth product of the op-amp.


The link to the related videos on the op-amp:

Introduction to Operational Amplifier:
https://www.youtube.com/watch?v=kiiA6WTCQn0

Inverting Op-Amp:
https://www.youtube.com/watch?v=AuZ00cQ0UrE

Non-Inverting Op-Amp:
https://www.youtube.com/watch?v=uyOfonR_rEw

Op-Amp Integrator
https://www.youtube.com/watch?v=OPvs7A554Rw

This video will be helpful to all students of science and engineering in understanding the working of op-amp differentiator.

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