Calculateur de Filtre Coupe-Bande
Calculez les paramètres d'un filtre coupe-bande.
Ω
nF
Cutoff Frequency
1,591.5 Hz
Time Constant (RC)0.1000 ms
Cutoff Frequency vs Resistance
Formule
## RC Filter Cutoff **f_c = 1 / (2 x pi x R x C)** At the cutoff frequency, output is -3 dB (70.7%) of the input. The time constant tau = RC.
Exemple Résolu
R = 1k, C = 100 nF.
- 01C = 100 nF = 1e-7 F
- 02f_c = 1 / (2pi x 1000 x 1e-7) = 1591.5 Hz
- 03tau = 1000 x 1e-7 = 0.1 ms
Questions Fréquentes
What does -3 dB mean?
The output signal power is halved, or voltage is at 70.7% of input.
Low-pass vs high-pass?
Same cutoff frequency formula. Low-pass: output across C. High-pass: output across R.
How steep is the rolloff?
First-order RC filter rolls off at 20 dB/decade (6 dB/octave).
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