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How NMOS technology increases the density of transistors in the chip?

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lordsathish

lordsathish

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Hi BJT's were replaced by the NMOS technology because it increased the fabrication capability... how NMOS techonoly increased the density of transistors in the chip...
 

register nmos technology

As far as I know, BJT's weren't replace for that reason. MOS technologies were preferred over BJT techs because they consumed less power and because MOS technologies required less numbers of masks in the implementation process (which made them cheaper). The ability of increasing the chip's transistor density was a consequence of those two reasons, cause fabrication companies inverted more money in finding out ways of optimizing MOS circuit construction.
 

reasons from bjt to nmos/

isolation of nmos devices is much easier during integration (technology wise).

drift current operates in an nmos while diffusion current is main component in BJts; reducing transient delay for nmos ;therby higher frequencies could be used (Device level approach).

increasing density is not a valuable reason its a matter of tradeoff
 

n-mos technology

due to less power
 

Re: NMOS technology....

The BJT and the Nmos have there advanteges in the fields own by each other.But if we consider digital design then we will find that BJT is almost replaced by the NMOS .The switching is very fast in NMOS technology and also it dissipates less power than BJT's ....
 

Re: NMOS technology....

hey hi........BJT are not wholely replaced by NMOS technology....inspite of the fact MOS have some advantages over BJT,bt still BJT is used in many sectors.
 

Re: NMOS technology....

May be due to fabrication process????..
AS BJT needs P type , Ntype and if u see the chip block for BJT and NMOS, NMOS may needs less space for each transister...

But i am not sure of this..
 

NMOS technology....

Not true that NMOS replaced BJT... CMOS (PMOS and NMOS) replaced BJT because of digital circuits.
 

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