RC Filter Design

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Discussion in 'General Electronics Chat' started by laguna92651, Oct 8, 2008.

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Oct 8, 2008 #1

laguna92651 Thread Starter Active Member

Mar 29, 2008

101

0

Can someone point to some information to design a cascading RC filter. The help I've found sound far seem discuss more complex filters, Bessel etc. I have to design a straight RC filter.

Specs

Vo/Vin (f < 2KHz) 0dB

Vo/Vin (f = 20KHz) 3dB

and
Vo/Vin (f = 200KHz) < 15dB

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Oct 8, 2008 #2

mik3 Senior Member

Feb 4, 2008

4,846

69

In other words you need (approximately) a band pass filter with cutoff frequencies off 20Hz and 20KHz?

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Oct 8, 2008 #3

laguna92651 Thread Starter Active Member

Mar 29, 2008

101

0

Well, I was thinking more lowpass, that dropped off at 2KHz at 3 dB/decade, then at 20KHz dropped off again at 12dB/decade, to get me to -15dB at 200KHz. Is it unrealistic for the filter to go down to dc, if so 20 hz is fine.
Thanks for the help.

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