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Why we use insulator between gate and the substrate in NMOS?

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Shans60

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Can anyone explain me the reason to use insulator between gate and the substrate
 

Re: in nmos

if there is no insulation then there will be only conduction between gate and the body..... but since there is a insulation the body acts as one plate of a capacitor and the gate the other and hence the charge distribution is reciprocated ultimately forming the channel..........
 

Re: in nmos

Shans60 said:
Can anyone explain me the reason to use insulator between gate and the substrate


Only by this insulator , v r getting very high input impedance and gate current Ig=0... If u r not having insulator , u cant even say it is a voltage controlled device..
Hope u get the points.
All the best


Regards,
Venkatesan.s
 

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