Digital Filter: Low-Pass Design & Implementation
November 10, 2025
Abstract
This report discusses the design and implementation of low-pass filters, briefly visiting both their analog and digital domains. Basic passive filter types (RL and RC) are analyzed to identify their physical and electrical limitations, such as attenuation and loading effects. To overcome these, our group investigates active filter circuits using operational amplifiers. The study eventually lead us to the design of a fourth-order Butterworth low-pass filter, including the derivation of component values and digital filter coefficients for simulation in MATLAB and real-life lab implementation/testing.