filter_alt Signal Processing Calculator

Passive Filter Planner & Bode Plot Visualizer

Design low-pass, high-pass, band-pass, and band-stop filters with real-time Bode magnitude & phase plots. Fit component values to standard EIA series (E12/E24/E96) and see the impact on your frequency response — user-configurable sweep from sub-Hz to 100 GHz.

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Filter Design Parameters

filter_alt Filter Type & Topology

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Filter Response

Component Topology

settings_input_component Component Values

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Resistance (R) Ω

Capacitance (C) F

Inductance (L) H

frequency Frequency Range

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Start Hz

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End Hz

Range: any value > 0 Hz up to 100 GHz (1×10¹¹ Hz). Logarithmic sweep with 500 data points.

Sweep Points

precision_manufacturing EIA Value Fitting

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Preferred Series

Cutoff / Center Freq
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Quality Factor (Q)

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Damping Ratio (ζ)

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ω₀ (Angular)

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-3 dB Bandwidth

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Rolloff Slope

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Bode Magnitude Plot

Gain (dB) vs. frequency on a logarithmic scale. Orange = ideal, green = EIA-fitted.

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Bode Phase Plot

Phase shift (degrees) vs. frequency on a logarithmic scale. Orange = ideal, green = EIA-fitted.

functions Transfer Functions & Key Equations

f_c= 1 / (2π·R·C) [RC Low-Pass] H(s)= 1 / (1 + s·R·C) |H(jω)|= 1 / √(1 + (ω·R·C)²) ∠H(jω)= −arctan(ω·R·C) Q= (1/R)·√(L/C) [RLC] ζ= 1 / (2·Q) = R/(2)·√(C/L) BW= f₀ / Q [second-order]

Design your complete power architecture

Use Electronics Architect to model multi-rail AC and DC systems with real-time simulation, thermal analysis, and component sourcing.

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Note: These tools and articles provide theoretical estimates for educational purposes. Actual results may vary depending on real-world component tolerances, parasitics, and thermal conditions.