notes/Code for Butterworth Low Pass Design.md

Written by ChatGPT but checked against the data-sheet calculations.

#!/usr/bin/env python3 """ 2nd-order unity-gain Butterworth Sallen-Key low-pass calculator Based on TI SBOA226 design steps:

Usage: For 22k resistors and a cut-off f_c of 500Hz:

$ python3 --R 22E3 500

!butter_plot.py !butter_plot.py

Example

$ python3 butter_plot.py --R 22E3 500 2nd-order unity-gain Butterworth Sallen-Key LPF (ideal) fc = 0.5 kHz R1=R2= 22 kohm C1 = 20.46 nF (norm 1.414) C2 = 10.23 nF (norm 0.707) Q = 0.707107