The first-order RC low-pass filter has transfer function H(ω) = 1/(1 + j·ω·R·C), hence magnitude-squared |H(ω)|² = 1/(1 + (ω·R·C)²). The -3 dB cutoff frequency f_3dB = 1/(2π·R·C) is defined by |H(ω_c)|² = 1/2 — the half-power point. …
The first-order RC low-pass filter has transfer function H(ω) = 1/(1 + j·ω·R·C), hence magnitude-squared |H(ω)|² = 1/(1 + (ω·R·C)²). The -3 dB cutoff frequency f_3dB = 1/(2π·R·C) is defined by |H(ω_c)|² = 1/2 — the half-power point. …