NMOS/PMOS Def: What Does "N" & "P" Stand For?

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SUMMARY

The terms "N" and "P" in NMOS and PMOS transistors refer to the type of charge carriers that form the conductive channel when the transistor is activated. NMOS transistors utilize electrons as charge carriers and are built on p-type substrates, resulting in n-type channels. Conversely, PMOS transistors use holes as charge carriers and are constructed on n-type substrates, leading to p-type channels. This distinction is crucial for understanding the operational principles of enhancement and depletion modes in MOSFETs.

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steven-ka
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Hello! I would like to have some assistance with a simple definition.
When I get a question about Nmos or Pmos, let's say enhancement mode and depletion(both cases), what does the 'N' or 'P' stands for? is it the channel in the device or is it the substrate material?
And does it change when we talk about a NMOS or PMOS capacitor?
I'll appreciate any comment that would help me out! thanks in advance!
 
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Hey Steven,

N and P, in both cases (enhancement/depletion), refer to the type of carrier (electrons or holes) that form the channel when the transistor is "on". So NMOS transistors have p-type substrates but form n-type channels when the transistor is on. PMOS is exactly the opposite.

Regards,
Matt
 

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