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How to know when to use PMOS or CMOS transistors?

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puthem1st

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I need help understanding the difference between nmos pmos and cmos transistors? Still not getting the concept from the articles online. How do you know when to use each one??
 

Re: transistors

For simple understanding:
nmos is n-channel mosfet and is identical to npn transistor where you need positive voltage at the gate (base) to turn in on. pmos is identical to pnp and needs a negative voltage applied to the gate to turn it on. In CMOS, both transistors (nmos and pmos) are used.
When +ve voltage is applied, the nmos will be on and the transistor will be sinking current from output to ground. The output will be at logical '0'.
When -ve voltage is applied, the pmos will be on and the transistor will source current from VDD to the outpt. The output will be at logical '1'.
Hope that helps.
 

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    puthem1st

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Re: transistors

Identity of transistor mosfet and bipolar unreal !!!
Principles of the work it differs !
 

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