First Order Active Low Pass Filter Calculator Online

byee-diary • • 2 min read
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⚡ 1st Order Active Low Pass Filter Calculator

Unity Gain Non-Inverting · Non-Inverting with Gain · Inverting

Unity Gain
Non-Inverting
Inverting
Unity Gain Non-Inverting
Result
R1 — Series Resistor
Unity Gain Non-Inverting Active 1st order LPF
Formula
Series resistor (unity gain, Av = 1):
R1 = 1 / (2π · fc · C)
Non-Inverting with Gain
Results
R — Series Resistor (filter)
R1 — Gain-setting Resistor
Non-Inverting Active 1st order LPF circuit diagram
Formulae
Series resistor (sets cutoff frequency):
R = 1 / (2π · fc · C)
Gain-setting resistor:
R1 = RF / (Av − 1)
Passband gain:
Av = 1 + RF / R1
Inverting Active LPF
Results
R2 — Feedback Resistor (sets fc)
R1 — Input Resistor (sets gain)
Inverting first order active low pass filter circuit diagram
Formulae
Feedback resistor (determines cutoff frequency):
R2 = 1 / (2π · fc · C1)
Input resistor (determines gain):
R1 = R2 / Av
Voltage gain (inverting, magnitude):
|Av| = R2 / R1

About This Calculator

This online first order active filter calculator computes resistor values for a desired gain and cutoff frequency fc. Provide the passband gain (Av), feedback resistor RF, cutoff frequency, and capacitor value to find the remaining resistors.

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