Active Filter Design
|
Band-Pass Filter Calculator
·Op-Amp BPF Design Tool · Two Topologies
Circuit Diagram — Two-Pole Cascaded BPF
Frequency Response Preview
f_low
f₀ (center)
f_high
Design Equations
Q = f₀ / BW
f_l = f₀ − BW/2 f_h = f₀ + BW/2
R_A1 = 1 / (2Ï€ · f_h · C_A1)
R_A2 = 1 / (2Ï€ · f_l · C_A2)
Rg = Rf / Aáµ¥
f_l = f₀ − BW/2 f_h = f₀ + BW/2
R_A1 = 1 / (2Ï€ · f_h · C_A1)
R_A2 = 1 / (2Ï€ · f_l · C_A2)
Rg = Rf / Aáµ¥
Circuit Diagram — Multiple-Feedback BPF
Frequency Response Preview
f_low
f_c (center)
f_high
Design Equations
Q = f_c / BW
R₂ = Q / (Ï€ · f_c · C)
R₁ = R₂ / (2 · A₀) R₃ = Q / (2Ï€ · f_c · C · (2Q² − A₀))
Constraint: A₀ < 2Q²
R₂ = Q / (Ï€ · f_c · C)
R₁ = R₂ / (2 · A₀) R₃ = Q / (2Ï€ · f_c · C · (2Q² − A₀))
Constraint: A₀ < 2Q²
