help on frequency formula

Discussion in 'General Electronics Chat' started by joe99641, Nov 11, 2007.

  1. joe99641

    Thread Starter New Member

    Nov 9, 2007
    2
    0
    Could somebody out there help with this, I am trying to figure out what the following letters stand for in this formula, they are Wc, s, j ; the formula is
    LP=Wc^4/(Wc^2+1.414*Wc*s+s^2)^2 I also have the following information
    Wc=j*2*pi*Fc, Fc=crossover Frequency, s=j*2*pi*F, F=frequency in Hz.
    Any comments would be appreciated, Thanks
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    the W is actually the greek letter omega \omega

    \omega = 2\pi*f where f equals frequency.

    \omega_{c} Most likely this is being used to represent the corner frequency of a filter.

    The variable s = j\omega

    LP stands for lowpass. This indicates to me that the expression you have is the transfer function for a lowpass filter.

    Further to my earlier comments, the coefficients that appear in the denominator of the expression would lead me to conclude that the expression is for a 2-pole Butterworth Low Pass filter.

    hgmjr
     
  3. joe99641

    Thread Starter New Member

    Nov 9, 2007
    2
    0
    Thankyou,this is most helpful.
     
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