Hello,
I am having a little trouble calculating the upper cut off frequency of this Butterworth Filter in the Sallen and key configuration.
Below you can see the component values in the pic:
http://twitpic.com/152zmr
The upper cut off frequency here (according to my supervisors) is 28kHZ,
however using the equation I found:
fc=1/2pi(root(R1R2C1C2))
,it doesn't equal 28kHz, I am getting 44.209kHz?!
Am I using the wrong equation?
Any help would be much appreciated,
Regards,
Adam
I am having a little trouble calculating the upper cut off frequency of this Butterworth Filter in the Sallen and key configuration.
Below you can see the component values in the pic:
http://twitpic.com/152zmr
The upper cut off frequency here (according to my supervisors) is 28kHZ,
however using the equation I found:
fc=1/2pi(root(R1R2C1C2))
,it doesn't equal 28kHz, I am getting 44.209kHz?!
Am I using the wrong equation?
Any help would be much appreciated,
Regards,
Adam