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about noise of cascode MOS

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gingerjxb

gingerjxb

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hi

in general, the noise current contribution from cascode MOS is negligible, but why? i have read Razavi's book but i don't understand yet. somebody can give me an explanation?

thanks!
 

Hi
because small resistor (1/gm) of cascode source and large resostor (ro) of input transistor.
noise is divided between two resistors.
regards
 

    gingerjxb

    gingerjxb

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Basically all of the extra noise is "shunted" across the small resistor (1/gm).
 

    gingerjxb

    gingerjxb

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