* 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 ω_c using passband and stopband formulas

    • Calculate α_p1 and α_s1 using ω_c1 and calculate α_p2 and α_s2 using ω_c2

  • Determine normalized transfer function, H_n(s)

  • Determine the real / actual transfer function

• Standard low pass filter design:

  • Normalized inductors and capacitors

  • Real value of inductors and capacitors