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Filter Saturation

Discussion in 'Electronic Design' started by [email protected], Jun 21, 2005.

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  1. Guest

    I have read in many papers on design of LNA and Mixer to reduce the DC
    components at the output as these components might saturate the filters
    following these stages. What is 'saturation' of filter?
    Could anyone elaborate on this?

    Thank You.
     
  2. Joerg

    Joerg Guest

    I have read in many papers on design of LNA and Mixer to reduce the DC
    Unnecessary DC is generally only a problem if the current runs through a
    ferrite inductor or ferrite transformer winding. Ferrites can saturate
    and become non-linear when burdened with a hefty DC load.

    Regards, Joerg
     
  3. Chris Jones

    Chris Jones Guest

    Are you thinking of a direct conversion radio receiver? If so, the baseband
    filters (which usually have gain) could be saturated if the input voltage
    to the filters multiplied by the gain of the filters is greater than the
    supply voltage or the permissible output swing.
     
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