+/- Bandwidth definition?

Discussion in 'General Electronics Chat' started by perplexabot, Sep 8, 2014.

  1. perplexabot

    Thread Starter New Member

    Jul 3, 2012
    15
    0
    Hey all. So I been trying to buy a narrow BPF and on the datasheets it'll say something like: +/- 12.5 under 6dB bandwidth for a specific component. Here is a datasheet for reference if needed: http://pdf1.alldatasheet.com/datasheet-pdf/view/87544/ETC/CFWS455CY.html

    My question is, does +/- 12.5 Bandwidth mean 25 bandwidth?
    By +12.5 and -12.5 are those the pass band regions to the right and left of the center frequencies respectively?

    Thank you.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    Yes, the +/- 12.5 will mean a bandwidth of 25 kHz around the center frequency.
    You also see the bandwidth at 40 dB attenuation given.
    This will tell you how steep the filter is.

    Bertus
     
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  3. perplexabot

    Thread Starter New Member

    Jul 3, 2012
    15
    0
    Thank you.
     
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