Why we prefer the NMOS over PMOS?

[Shans60]

Can anyone give the reason for the preference of NMOS over PMOS in igital

 

[A.Anand Srinivasan]

Re: CMOS or PMOS

generally in a circuit the output impedance is kept constant especially in digital circuit since the output is mostly voltage the output impedance is maintained as low as possible..... the main problem is PMOS is more resistive... this is one of the reasons i know.........

 

[cl_mos]

Re: CMOS or PMOS

The majority carrier for a NMOS are electrons and holes for a PMOS. Electrons move about 2x faster than holes so NMOS have more drive per capacitance. To get the same drive strength of a NMOS the PMOS has to be 2x bigger than the NMOS causing the circuit to see more load due to the extra capacitance.

 

[neils_arm_strong]

CMOS or PMOS

and also NMOS is more faster than PMOS .So it can be used at high frequencies than PMOS

 

[venkat3271]

Re: CMOS or PMOS

Due to three reasons..


1) NMOS Faster than PMOS

2)NMOS canbe made smaller than PMOS

3)NMOS requires low supply voltages than PMOS..


Regards,
Venkatesan.s

 

[gbaerf]

CMOS or PMOS

Electrons are majority carriers in NMOS but whols are in PMOS , and mobility of electrons are higher that is one of the reason it prefering over PMOS ...
because of mobility it becomes faster and requires low power as well.....

PMOS is mostly used as load ...

More clarification U have asked over PMOS or CMOS

CMOS is completly different device...

with regards,

 

[mosti]

CMOS or PMOS

In most technologies PMOST have larger threshold voltages, so NMOST is preferable for low power, if you don't use CMOS. Besides the faster speed (electrons) already mentioned in the above post.