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

 

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.

 

A calculator -

http://sim.okawa-denshi.jp/en/Sallenkey3Lowkeisan.htm

Regards, Dana.

 

As your posting in the digital section, are you looking for a digital circuit ?

 

As your posting in the digital section, are you looking for a digital circuit ?

He asked about resistors and capacitors, so I would assume not.