RC Filter Design

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

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  1. 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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  2. Oct 8, 2008 #2
    mik3

    Senior Member

    Feb 4, 2008
    4,846
    70
    In other words you need (approximately) a band pass filter with cutoff frequencies off 20Hz and 20KHz?
     
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  3. 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.
     
    #3 Reply
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