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.
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
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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