23::07_07-04-24_@IIIT_H how Vd effects voltage at MOS_Cap (surface inversion layer) --> what if Vd>Vg-Vth...? inversion (e^-)charge decreases : Pinch-Off
From previous lecture, we know Qi' = - Cox (Vg - Vt). Here, an extra term (-V = - V(x)) comes because as we are applying the Vd at one end, it will create a voltage gradient along the channel length called V(x) for an element length 'dx', which will oppose the voltage applied at Vg.
Sir, Why the surface charges (we are using Phis potential) are not participating in conduction, they are also free charges on surface right ?
They are not mobile.
Why was there a minus sign at 6:52 ,when in previous video that equation was positive
Because in inversion region free electrons are present. If we are considering immobile ions then there would have been a positive sign.
23::07_07-04-24_@IIIT_H
how Vd effects voltage at MOS_Cap (surface inversion layer) --> what if Vd>Vg-Vth...? inversion (e^-)charge decreases : Pinch-Off
@ 5:56 how did he write Q'I here? complete explanation, please.
From previous lecture, we know Qi' = - Cox (Vg - Vt). Here, an extra term (-V = - V(x)) comes because as we are applying the Vd at one end, it will create a voltage gradient along the channel length called V(x) for an element length 'dx', which will oppose the voltage applied at Vg.
can i get the slides presented in the lectures anywhere?
yes, it is there on the nptel website.