Active High Pass Filter


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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 Filters can be found  here  or  here  or with the help of  Google 


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2 Pole Active High Pass Filter


Input

Calculated Values

  Filter Type :  
  Capacitors :  uF  
  3dB Cutoff Freq :  Hz  
 
C1,C2 =  uF  nF
R1 =
R2 =
Schematic, 2 pole highpass filter


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2 Pole Highpass Active Filter with Gain


Input

Calculated Values

Filter Type :
Capacitor C1 : uF
3dB Cutoff Freq : Hz
Voltage Gain : Vu
R1 =
R2 =
C1 = uF nF
C2 = uF nF
C3 = uF nF
Amplification = dB
Schematic, 2 pole lowpass active filter


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3 Pole Active High Pass Filter


Input

Calculated Values

Filter Type :
Capacitors : uF
3dB Cutoff Freq : Hz
C1,C2,C3 = uF
R1 =
R2 =
R3 =
Schematic, 3 pole highpass filter


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Linkwitz High Pass Filter 24dB

Unity Gain in the Passband, 24 dB / Octave, 2 x 2nd order

Input

Calculated Values

Cutoff Freq. : Hz
C : nF



R1 =
R2 =
R3 =
R4 =

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