* Lecture 3: Butterworth Filter

Butterworth Filter:

You can find the lecture Note in the attachment.

Course Outline:

• Butterworth filter design: Transfer function:

  • Order number, n

  • Calculate ωc using passband and stopband formulas

    • Calculate αp1 and αs1 using ωc1 and calculate αp2 and αs2 using ωc2

  • Determine normalized transfer function, Hn(s)

  • Determine the real / actual transfer function

• Standard low pass filter design:

  • Normalized inductors and capacitors

  • Real value of inductors and capacitors