Circuit Theory-2 #24 | Active Low-Pass and High-Pass Filters

Instructor: Dr. Süleyman Burak ÇELİK

In this Circuit Theory-2 lesson we move from passive filters to active RC filters and use an op-amp to add buffering, gain, and cleaner design control. You will learn: - Why active filters use an op-amp with R and C - How an inverting active low-pass filter works - Why a feedback capacitor reduces high-frequency gain - How pass-band gain and cutoff are set separately - How an inverting active high-pass filter works - Why an input capacitor blocks low frequencies - How low-pass and high-pass magnitude curves compare - A quick design workflow: choose C, compute R - Why op-amp bandwidth, slew rate, output swing, load, and tolerance still matter - A compact recipe for first-order active filter design Timestamps: 00:00 Active low-pass and high-pass filters 00:03 From passive filters to active filters 00:28 The op-amp changes what a filter can do 00:49 Inverting active low-pass 01:15 Low-pass gain and cutoff 01:37 Inverting active high-pass 01:56 High-pass gain and cutoff 02:15 Magnitude curves 02:36 Quick design examples 03:03 Real op-amp limits 03:23 Active-filter recipe 03:47 Summary Next lesson: active band-pass, active band-reject, and Butterworth intuition. Part of the Circuit Theory-2 playlist by AcEdumy.