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Active_Notch_Filter.php    12412 Bytes    23-04-2024 12:37:18


Active Twin - T - Notch Filter Calculator




• Suiteable to attenuate a 50 Hz ( 60 Hz ) noise
• Select parts with low tolerance / equal value !
• Design of this calculator was inspired by : Ferdl
• Maybe helpful : FIND PARALLEL RESITORS

With passive networks, the Q is fixed to 0.25 - introducing a variable Feedback 'k' allows the Q to be adjusted. Changing the Q will also change the notch-depth. For numerical reasons, we limited the range of k : 1 < k < 99 [%].



Twin - T - Notch Filter

Center Frequency
[Hz]
Feedback
[%], 1.0 < k < 99.0
Bandwidth
[Hz]
Q
 
C1, C2
[nF]
C3
[nF]
R1, R2
[kΩ]
R3
[kΩ]
R4
[kΩ]
R5
[kΩ]





Simulations :




Simulations were done using TARGET 3001. Center Frequency : 50 Hz

NOTE: Even the Simulations suggest Attenuations of 100 dB and more, real - life values are in the range of 40 ... 60 dB !

Parts used in Simulation :

R1 = R2 = 318.3 kΩ
R3 = 159.2 kΩ
C1 = C2 = 10 nF
C3 = 20 nF
R4, R5 : various values
OPAMP: LM358

Target 3001 FileActive_Notch_Filter_2.T3001



 
 k = 99 %
 R4 = 1 kΩ
 R5 = 99 kΩ
 B = 2 Hz
 Depth : 78.2 dB
 122.9 mV








 
 k = 90 %
 R4 = 10 kΩ
 R5 = 90 kΩ
 B = 20 Hz
 Depth : 97.2 dB
 13.8 mV








 
 k = 80 %
 R4 = 20 kΩ
 R5 = 80 kΩ
 B = 40 Hz
 Depth : 103 dB
 7.16 mV








 
 k = 70 %
 R4 = 30 kΩ
 R5 = 70 kΩ
 B = 60 Hz
 Depth : 106 dB
 4.79 mV








 
 k = 60 %
 R4 = 40 kΩ
 R5 = 60 kΩ
 B = 80 Hz
 Depth : 109 dB
 3.58 mV












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t1 = 6585 d

t2 = 169 ms

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