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twolevel2002 said:Hi All:
If mos length increases and Vth will decrease.
Why ?
Thank you.
twolevel2002 said:Hi All:
If mos length increases and Vth will decrease.
Why ?
Thank you.
pbs681 said:twolevel2002 said:Hi All:
If mos length increases and Vth will decrease.
Why ?
Thank you.
Actually Vth for bigger length is the reference Vth. You should ask "If mos length decrease, why the Vth increase"...
This happen because of the Reverse Short Channel Effect(RSCE)...
leelamadhav said:What is Reverse Short channel effect,,, could you please explain.. i want to know more... how does Vt increase in length decrease ??
Vth also affected by DIBL, but this effect happen because we have high drain voltage..... the smaller the L, the bigger the effect- provided we have high drain voltage......leelamadhav said:In MOS Length Increased Vth decrease ????.. Think it is as the length decreases as the S/D come closer... There would DIBL effect... and also due to charge sharing.. The Vt decreases...
pbs681 said:leelamadhav said:What is Reverse Short channel effect,,, could you please explain.. i want to know more... how does Vt increase in length decrease ??
Nowadays we put punchthrough implant near source and drain to avoid the punchthrough. As the length decrease, the seperation of these 2 implants become smaller and eventually overlap each other. We know that this implant is the opposite doping type of the sorce and drain..... so, when this happen, as the L decrease, Vth will increase first to form hump before it follow normal trend.... that is what we call reverse short channel effect.....
Added after 6 minutes:
Vth also affected by DIBL, but this effect happen because we have high drain voltage..... the smaller the L, the bigger the effect- provided we have high drain voltage......leelamadhav said:In MOS Length Increased Vth decrease ????.. Think it is as the length decreases as the S/D come closer... There would DIBL effect... and also due to charge sharing.. The Vt decreases...
arbil said:pbs681 said:leelamadhav said:What is Reverse Short channel effect,,, could you please explain.. i want to know more... how does Vt increase in length decrease ??
Nowadays we put punchthrough implant near source and drain to avoid the punchthrough. As the length decrease, the seperation of these 2 implants become smaller and eventually overlap each other. We know that this implant is the opposite doping type of the sorce and drain..... so, when this happen, as the L decrease, Vth will increase first to form hump before it follow normal trend.... that is what we call reverse short channel effect.....
Added after 6 minutes:
Vth also affected by DIBL, but this effect happen because we have high drain voltage..... the smaller the L, the bigger the effect- provided we have high drain voltage......leelamadhav said:In MOS Length Increased Vth decrease ????.. Think it is as the length decreases as the S/D come closer... There would DIBL effect... and also due to charge sharing.. The Vt decreases...
In razavi's book, there is a sentence saying that vth decreases as L decreases...
but i think your opinion looks reasonable, can you give some examples of actual processes? thanks very much!