Why we use P type substrate

Hi, I have one question, please get me answer for this question, Why we use p-type substrate why not n-type substrate? regards sagar

Asked By: apna_sagar
On: Aug 8, 2005 3:09:59 AM

Comments(4)

why P substrate is more preferred than N type substrate

Comment By: yaman mach
On: Oct 15, 2007 9:41:25 AM

Hi metal: thank you very much, it's my first time to understand the reason that using p-type sub usually.

Comment By: oceanwave
On: Sep 14, 2005 11:00:24 AM

hi sagar & radhika, actually the main reason behind using a p type substrate is that the cost of implementing an n type substrate as a default base is pretty higher than that of using a p type substrate also process limitaions make it a little tough and not a very acurate option if we use an n type substrate one one more point of view if we consider the physics of the n type substrate is, they tend to carry electrons as carriers which are more mobile than the holes ....to be precise somewhere around 3 times more mobile, so if we are using an n type substrate, then subsrate noise could also become a major factor.

Comment By: metal
On: Aug 23, 2005 12:21:29 AM

It depends. For PMOS we use n type substrate and for NMOS we use P type substrate. More common is NMOS devices, so we use P type substrate. Radhika

Comment By: radhika iyer
On: Aug 8, 2005 5:15:06 PM

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