PMOS have a lower flicker noise than NMOS?

[davidwong]

why flicker noise is more in nmos than pmos

I heard that PMOS have a lower flicker noise than NMOS?
Is it correct?

 

[qasmi]

Yes it is correct.

 

[suhas_shiv]

Yes PMOS has lesser flicker noise than NMOS. Flicker noise is observed only when a DC current flows. Since mobility of NMOS is greater than PMOS, flicker noise is larger in NMOS(for the same W/L).

 

[davidwong]

For the same current,
will PMOS still have the lower flicker noise?

 

[demodb]

yes it will, because of the reason suhas_shiv mentioned. It has lower mobility.

 

[erictmt]

I think it's related to the surface state of the MOS device. Since the semiconductor and the oxide layer has some interface charge, it causes interface traps, which is more serious for electrons than for holes.

 

[nagula suresh]

flicker noise is due to the random trapping and releasing of the electrons or holes in the interface.
as electrons have more mobility than holes,so they will have more random trappings.
so more flicker noise for nmos devices.

 

[elbadry]

I think that this is technology dependent. It is a common-saying that PMOS has better flicker but you have to check if this is valid for your technology.