Calculate Active Low Pass Filter



Active filter design precautions


When building the active filter circuit, high tolerance components must be used to obtain the best performance. Typically they should be 1% or better.

A further item to ensure the optimum operation of the circuit is to ensure that the source impedance is less than about 100 ohms. Additionally the load impedance should be greater than about 2 M Ohms.


More info about Active Band Pass Filters can be found  here  or  here  or with the help of  Google 


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2 Pole Low Pass Filter


Input

Calculated Values

Filter Type :
Resistors :  kΩ
3dB Cutoff Freq :  kHz

R1, R2 =  kΩ
C1 =  uF nF
C2 =  uF nF
Schematic, 2 pole lowpass active filter


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2 Pole Lowpass Filter with Gain


Input

Calculated Values

Filter Type :
Resistor R1 : kΩ
3dB Cutoff Freq : kHz
Voltage Gain :
R1 = kΩ
R2 = kΩ
R3 = kΩ
C1 = uF nF
C2 = uF nF
Amplification = dB
Schematic, 2 pole lowpass active filter


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3 Pole Low Pass Filter


Input

Calculated Values

Filter Type :
Resistors : kΩ
3dB Cutoff Freq : kHz
 
R1, R2, R3 = kΩ
C1 = uF nF
C2 = uF nF
C3 = uF nF
Schematic, 3 pole lowpass active filter

 

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Linkwitz Lowpass Filter 24dB


Input

Calculated Values

Cutoff Freq. : kHz
R :



C1 = nF
C2 = nF
C3 = nF
C4 = nF

Image


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