Transfer function

Discussion in 'General Electronics Chat' started by sparga, Oct 31, 2012.

  1. sparga

    Thread Starter New Member

    Oct 31, 2012
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    Hy, I can't figure out the transfer function for the following circuit.
    [​IMG]

    I need to get iout/iin (iiz/iul). can anyone help me?
     
  2. sparga

    Thread Starter New Member

    Oct 31, 2012
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    pleas, can anyone help me?
     
  3. Audioguru

    New Member

    Dec 20, 2007
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    896
    The "CFOA" does not have a part number and you did not post its datasheet so we don't know what it is.
     
  4. sparga

    Thread Starter New Member

    Oct 31, 2012
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    I will use the AD844 component.
    [​IMG]

    the W pin is the O pin on my picture.

    the ccii+ component works like this:
    [​IMG]
     
  5. The Electrician

    AAC Fanatic!

    Oct 9, 2007
    2,285
    329
    You haven't identified Iin, Iout, etc. How do you expect anyone to help you if you don't specify those currents?
     
  6. sparga

    Thread Starter New Member

    Oct 31, 2012
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    that are the two curents on the picture. iul=Iin (on the left side) and iizl=Iout (on the right side).

    I have specifyed the currents in my first post.
     
  7. sparga

    Thread Starter New Member

    Oct 31, 2012
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    on the pictures you can see what I have done. I can't find the mistake. also, on the pdf documet, there is a circut like mine, just a litle different.
     
  8. Audioguru

    New Member

    Dec 20, 2007
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    Your "pictures" have grey lines on a grey background which are not black lines on a white background. So we can't see them.
     
  9. sparga

    Thread Starter New Member

    Oct 31, 2012
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    you have the picture of the circuit. you don't need anything else to get the transferfunction.

    If you won't help, then don't post anything!
     
  10. electron_prince

    Member

    Sep 19, 2012
    93
    3
    sorry i have no idea how to solve for it. This circuit is quite complicated for me. Just asking out of my curiosity, did you try finding some simulation program which can help you. maybe you won't get transfer function but perhaps you can get an impulse response graphically?
     
  11. sparga

    Thread Starter New Member

    Oct 31, 2012
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    I tryed altium designer, but I haven't spent much time on it. my focus is on solving the transfer function. afther that I will try to project the filter.
     
  12. sparga

    Thread Starter New Member

    Oct 31, 2012
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    does anyone know how to get the trensfer function?
     
  13. ramancini8

    Member

    Jul 18, 2012
    442
    118
    The bottom amp is not connected except for the z output that connects to a current source, thus I assume that it is a no-op. The top circuit is a filter, just look up its topology in a filter handbook to get the transfer function or write the equations if you can.
     
  14. sparga

    Thread Starter New Member

    Oct 31, 2012
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    I wrote the equations. I have put pictures of what I have done a few posts before.
     
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