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What is the burried channel responsible for lower filcker noise in PMOS?

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safwatonline

safwatonline

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i read that flicker noise in PMOS is lower than hat in Nmos due to the burried channel, can anyone explain what is the burried channel?
 

filcker noise

that is because the mobolity of the 'caves' is smaller than the "electrons' in NMOS.

so usually when the circuit is working in low frequency, usually the PMOS will be used as the input diff pair.
 

filcker noise

hello,
thnx for reply , i don't get the term burried channel , why the channel is burried and how is that related to mobility.
 

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