Equal Component Butterworth Low Pass Filter Calculator

Enter value of Cutoff Frequency, any one value - Resistor or Capacitor, any one value - Resistor Rc or Resistor Rd and click on calculate. Result will be displayed.


Ra = Filter Resistor
Rb = Filter Resistor
(Ra = Rb)
Ca = Filter Capacitor
Cb = Filter Capacitor
(Ca = Cb)
Rc = Feedback Resistor
Rd = Feedback Resistor

Cutoff Frequency:

(Enter any one value - Resistor or Capacitor and
any one value - Resistor Rc or Resistor Rd)

Resistor (Ra = Rb):
Capacitor (Ca = Cb):
Resistor Rc:
Resistor Rd:

An Equal Component Butterworth Low Pass Filter Calculator is a tool used to design a Butterworth low-pass filter where all resistors and capacitors have equal values for easier implementation. This type of filter provides a maximally flat frequency response, meaning no ripples in the passband.

Key Features:
Equal Component Design: Uses identical values for resistors and capacitors.
Butterworth Response: Ensures smooth attenuation without ripples.
Cutoff Frequency (fc): The frequency where the output falls to -3 dB of the maximum value.
Order (N): The number of reactive components (capacitors/inductors) determining the filter's sharpness.
Formula for Component Calculation:
For an equal component second-order Butterworth filter:


Usage:
Input the desired cutoff frequency (fc)
Choose a suitable capacitor value (C)
The calculator determines the resistor value (R)