Active filter a Low Pass Butterworth

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Nadir96

Joined Jan 18, 2018
1
Hi I’m trying to design a 3rd order Butterworth filter but I have only been giving the the roll off of 60dB and the cut off frequency of 14khz how can I find the component values for the resistor and the capacitor
Any ideas guys would be be much appreciated
 

crutschow

Joined Mar 14, 2008
23,371
I’m trying to design a 3rd order Butterworth filter but I have only been giving the the roll off of 60dB and the cut off frequency of 14khz
That would be a rolloff of 60dB/decade I presume, which is a 3-pole characteristic.

Here's a 3-pole, single opamp, active low-pass filter design article.
That should give you all the info you need.
 
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