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Ferrite bead for composite/svideo input?

Discussion in 'Electronic Design' started by Ben Jackson, Jun 26, 2007.

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  1. Ben Jackson

    Ben Jackson Guest

    Can someone recommend a ferrite bead for composite video input purposes?
    I can find beads that have ~75R impedence at 9MHz (which would be a 3dB
    loss into the 75R termination) but I don't know if I should stay far,
    far away from that corner with a bead.

    I've looked at some consumer electronics and most seem to use a bead of
    some kind but of course it's hard to know its properties without pulling
    it out and applying a VNA.
     
  2. ISTR that LT spice has a whole pile of Wurth ferrites in the libraries


    martin
     
  3. john jardine

    john jardine Guest

    I've seen no visible picture degradation using low pass filters in the
    8-10MHz area.
    Had a DVR video interference problem the other week. Turned out the DVR was
    mixing down ~13Mhz noise peaks on the incoming composite signals. Crap DVR.
    Sorted using external lowpass filters. So yes, filtering somehow at lowish
    frequencies may be advisable.
     
  4. Winfield

    Winfield Guest

    Is this something we should emulate? I've not used lossy beads
    in my video-processing designs, and I don't recall seeing them
    used that way in professional video inputs. What's the story?
    If a low-pass filter is required for some reason, let it be a
    real properly-designed filter.
     
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