LOW PASS FILTER (Clipping in input sinewave)

Discussion in 'The Projects Forum' started by mokong, Nov 11, 2011.

  1. mokong

    Thread Starter New Member

    Oct 14, 2011
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    Last edited: Nov 11, 2011
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Without seeing your circuit, I'll have to say you have a/some wrong part(s) somewhere.\

    I don't know how you expected to get a useful reply without your schematic diagram.

    Upload it using the "Go Advanced" and "Manage Attachments" buttons.

    .PNG format files are preferred.
     
  3. mokong

    Thread Starter New Member

    Oct 14, 2011
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  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Your input swings above and below ground (0V). Your op amp outputs can't go below ground. You need to use a negative supply for Vee, or you need to bias the input signal up to Vcc/2 by capacitor-coupling the input signal into a voltage divider on the left end of R5.
     
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  5. crutschow

    Expert

    Mar 14, 2008
    12,993
    3,227
    Ron H is correct. Obviously the op amp outputs can't go below ground if they don't have a negative supply.

    If you want to design and simulate active filters you might try the free FilterPro design program from TI, if you don't already have it.
     
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