Circuit Theory-2 #26 | Active Filter Design Practice: Specs to Stages

Instructor: Dr. Süleyman Burak ÇELİK

In this Circuit Theory-2 lesson we turn active-filter intuition into a practical design workflow: specification, frequency targets, order choice, section split, topology, component scaling, loading checks, and verification. You will learn: - Why every filter design should start from a clear specification box - How to name cutoff frequency, lower edge, upper edge, center frequency, bandwidth, and Q - How filter order controls roll-off and circuit complexity - Why higher-order active filters are usually split into smaller cascaded sections - When Sallen-Key, multiple-feedback, and RC-plus-buffer sections are useful - Why gain distribution matters for headroom, clipping, and noise - How component scaling turns formulas into real resistor and capacitor values - How source loading, interstage loading, and output loading can move the response - What to verify before calling an active filter design finished Timestamps: 00:00 Active filter design practice 00:03 From filter shapes to buildable stages 00:21 Start from the specification 00:44 Name the frequency targets 01:07 Choose order from separation 01:26 Split a large filter into sections 01:45 Pick a topology 02:06 Distribute gain before it bites 02:25 Scale components into real parts 02:47 Watch loading between stages 03:07 Verify against the first box 03:26 Summary Next lesson: two-port networks with z and y parameters. Part of the Circuit Theory-2 playlist by AcEdumy.