Butterworth Filter Design: Low & High Pass

In this video, the design of higher order Butterworth Low pass and High pass filter has been discussed.
In this video, you will learn how to design Butterworth Low pass and High pass filters using the resistors, capacitors and active components like an Op-Amp.

Butterworth Filter Design:

For second Order Butterworth Filter design, the value of Quality factor (Q) in the transfer function should be equal to 0.707.
In this video, the Butterworth filter design using Sallen Key Filter Topology has been discussed.

By cascading the second order filters, higher order filters can be designed. (During the higher order filter design, the Q of each second order filter may be higher or lesser than 0.707, so that at the cut-off frequency the amplitude is 0.707 times the maximum value.)

The link for the derivation of the transfer function of the sallen key filter topology.

https://drive.google.com/open?id=1igXSBw6Rmb_HtWzGtKW9q41lELzbY-V7

The timestamps for the different topics is given below:

1:16 Transfer function of Second Order Low Pass Filter

3:42 Criteria for Second-Order Butterworth Filter Design (Q= 0.707)

6:16 Sallen Key Filter Topology

11:44 Third Order Butterworth Filter Design Example

14:09 Butterworth High Pass Filter Design

This video will be helpful to all the students of science and engineering in learning, how to design the higher order Butterworth Low pass and High Pass filters.

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