3db bandwidth

Discussion in 'Homework Help' started by jstrike21, Feb 22, 2010.

  1. jstrike21

    Thread Starter Member

    Sep 24, 2009
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    I have the equation attached.
    I derived this transfer function. how do I obtain the 3dB bandwidth from this?

    [​IMG][​IMG][​IMG]
    [​IMG][​IMG][​IMG][​IMG][​IMG]
     
  2. GirishC

    Active Member

    Jan 23, 2009
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    1. You need to find max gain for given R & C values.
    2. Subtract 3dB gain from max gain
    3. Solve for the w for given R, C & calculated 3dB point

    This is my theoretical approach...I am unsure though
     
  3. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    I don't think it has a 3dB point. 1/s is factorable from your equation, which is a pole at the origin. The gain is infinite at DC. How much is ∞ - 3dB?:D
     
  4. hgmjr

    Moderator

    Jan 28, 2005
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    Can you take another stab at attaching the images that did not make it into your post? It appears that the failed links are pointing to files on your local machine.

    hgmjr
     
  5. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Do you think there is more than an equation, or can't you see it?
     
  6. The Electrician

    AAC Fanatic!

    Oct 9, 2007
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    Maybe it's in your derivation that the problem lies. Why don't you show the circuit from which you derived the transfer function, plus your work in doing the derivation?
     
    Last edited: Feb 25, 2010
  7. t06afre

    AAC Fanatic!

    May 11, 2009
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    Creating a Bode plot is the simplest I guess.
     
  8. hgmjr

    Moderator

    Jan 28, 2005
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    I'm thinking there is more than just the equation, which I can see. I see six failed links because they were links to the OP's local computer.

    hgmjr
     
  9. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    I can't see any failed links. Can you see them because you're a super-mod?
     
  10. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    All those links in the OPs message failed.
     
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