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Filters and Bode plots
Read |H(jω)|, mark fc at −3 dB and watch the first-order slope.
Key formulas
- RC low-pass filter
The RC low-pass |H|=1/√(1+(ωRC)²) rolls off after cutoff on the Bode plot.
- RC cutoff frequency
fc=1/(2π RC) is the cutoff where |H| is 1/√2 (−3 dB) on the Bode plot.
- RC high-pass filter
The RC high-pass rises +20 dB/dec below fc and approaches 0 dB above cutoff.
- Gain in decibels
Computes Gain in decibels from the circuit model and the stated conditions.