2-pole active filter question
Hello! I am desiging in PSpice a 2-pole active filter. the values are taken from a wikipedia example to be sure about the fcut.
http://i1284.photobucket.com/albums/a578/fovos1/activefilter2polesallenkeytopology_zps30b85696.png
this is the circuit http://en.wikipedia.org/wiki/File:Sallen-Key_Lowpass_Example.svg
and the fcut=16KHz. but when i am doing it in pspice the fcut is at 10khz.
i tried with other values and again problem. i read about FREQUENCY SCALING FACTOR accoring to Butterworth filter but i don't understand
why for example wiki has wrong fcut. what is this value?
at pages 9 to 10 texas instruments has some tables with FSF depending of what filter design you like.BUT ONLY ABOUT LOW PASS FILTERS....
http://www.ti.com/lit/an/sloa049b/sloa049b.pdf
please someone to explain.thanks a lot
http://i1284.photobucket.com/albums/a578/fovos1/activefilter2polesallenkeytopology_zps30b85696.png
this is the circuit http://en.wikipedia.org/wiki/File:Sallen-Key_Lowpass_Example.svg
and the fcut=16KHz. but when i am doing it in pspice the fcut is at 10khz.
i tried with other values and again problem. i read about FREQUENCY SCALING FACTOR accoring to Butterworth filter but i don't understand
why for example wiki has wrong fcut. what is this value?
at pages 9 to 10 texas instruments has some tables with FSF depending of what filter design you like.BUT ONLY ABOUT LOW PASS FILTERS....
http://www.ti.com/lit/an/sloa049b/sloa049b.pdf
please someone to explain.thanks a lot
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Comments
I don't want to see your third attempt at getting help to go unnoticed.
I think this thread should be moved to the general discussion section. I am sure you will get the help you need.
(I am starting to think they should change the name of this forum section from Projects, to Finished Projects...)
Honestly, I have no idea what you are asking, I'm sure it's important, I just don't have the knowledge, I wish I could help. The best I can do, is suggest you request your thread be moved to General Discussion...
-Tommy
Is there a way you can increase your resolution in the simulation?
No problem about the move to General Discussion ~: )
Hi and thanks for the reply.it is not a problem of cursor or resolution my friend :P