uSimmics (QucsStudio) Tutorial Roadmap: Beginner to Advanced

Common-mode vs normal mode — what's the difference, and why is common mode easy to remove? Learn the definitions (EN = EA−EB, EC = (EA+EB)/2), how a common-mode choke and differential receiver reject it, explained with filter circuits.

Why does a PCB radiate noise? The hidden loop formed by a signal trace and its GND return sets the radiation. Learn why radiation ∝ loop area × current × frequency², and how a ground plane minimizes the loop.

Single-point ground or a ground plane? Both are correct — but which you use depends on frequency. Learn how common impedance and stray capacitance decide it, compared in uSimmics, plus mixed analog/digital board tips.

Why must a decoupling capacitor sit close to the IC? Learn how wiring inductance (L_wire) and the capacitor's ESL kill high-frequency performance, verified with uSimmics waveforms, plus two-stage placement and layout tips.

GND is supposed to be 0V — so why does noise appear? Learn how wiring inductance and V = L×di/dt cause ground bounce, verified with uSimmics simulations, plus three fixes: decoupling caps, a solid ground plane, and reducing di/dt.