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Active Filter Designer

A browser-local Active Filter Designer for electronic-information study and early engineering checks.

Browser-local calculationEqual-component Sallen-Key

Quick guide

How to use “Active Filter Designer”

3-step guide +
  1. Enter parametersProvide values, units, or local files using the field guidance.
  2. CalculateClick Calculate to see key values, formulas, units, and model notes.
  3. Check limitsReview assumptions and limits before using the estimate in a real design.

Input

Parameters

A
Filter settings
Enter a valid filter type. Check the result notes for model assumptions and limits.
Design targets
Hz
Enter a valid cutoff frequency f₀ in Hz. Check the result notes for model assumptions and limits.
Enter a valid quality factor q. Check the result notes for model assumptions and limits.
Device parameters
Ω
Enter a valid resistance r in Ω. Check the result notes for model assumptions and limits.

Preview updates locally; click Calculate to write shareable parameters.

Output

Calculation result

B
Loading this tool…
Results will appear here.

Local actions

Calculated in this browser; parameters are not uploaded.

More actions

Knowledge recall

Concept notes

NOTE

Concepts, relationships, and engineering limits.

01 / 30-second recall

Active Filter Designer uses the Equal-component Sallen-Key model to connect the entered parameters with a practical engineering quantity. The result is a local estimate, not a measurement.

02 / Core relationship

Use the displayed Equal-component Sallen-Key relationship with consistent SI units. Keep the formula, unit conversion, and sign convention together when checking the result.

03 / When to use

Enter the values you actually know, calculate, and then compare the result with the expected range, component limits, and the operating conditions of your design.

Active Filter Designer teaching diagram
Teaching diagram for the Equal-component Sallen-Key model used by this tool.
Common pitfalls

Do not treat a nominal value or a first-order model as proof that a real circuit will meet its tolerance, stability, thermal, timing, or signal-integrity requirements.

Engineering note

Use this result for learning and early planning. Confirm the final design with the relevant datasheet, simulation, measurement, layout review, and worst-case conditions.

FormulaCalculation basis
  • Use the displayed Equal-component Sallen-Key relationship with consistent SI units. Keep the formula, unit conversion, and sign convention together when checking the result.
LimitsAssumptions & limits
  • Use this result for learning and early planning. Confirm the final design with the relevant datasheet, simulation, measurement, layout review, and worst-case conditions.