electrical

RC / RL Filter

Cutoff frequency, time constant, and attenuation for RC and RL low/high-pass filters — Bode plot.

Filter Type

Inputs

Resistance R

Capacitance C

Results

Cutoff fc = 1/(2πRC)—

Time constant τ = RC—

Impedance at fc Xc = R—

Attenuation at 2×fc—

Attenuation at 10×fc—

fc = 1/(2πRC) · −3 dB at fc · −20 dB/decade rolloff