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Short channel effect on Threshold Voltage of a MOSFET.

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iVenky

iVenky

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In a short channel MOSFET the source-drain charge increases when compared to the channel charge (in the static conditions). So what will happen to the threshold voltage? Will it increase or decrease?
 

yadavvlsi said:
In short channel MOSFETs threshold voltage decreases. This effect is called Drain Induced Barrier Lowering

http://www.cs.ucl.ac.uk/staff/ucacdxq/projects/vlsi/report.pdf
Click to expand...

thank you for your help

---------- Post added at 12:27 ---------- Previous post was at 12:26 ----------
yadavvlsi said:
In short channel MOSFETs threshold voltage decreases. This effect is called Drain Induced Barrier Lowering

http://www.cs.ucl.ac.uk/staff/ucacdxq/projects/vlsi/report.pdf
Click to expand...

thank you for your help
 

In short channel MOSFETs threshold voltage decreases. This is correct.
 

iVenky said:
Who is correct?
Click to expand...

Both probably. In the 180nm process I'm working in now the Vt increases for shorter channels. I seem to remember a process where Vt went down as channels got shorter but can't say for sure... it seemed like it went down for one MOS type and up for the other.

DIBL is a lowering of Vt with an increase in drain voltage. Its effect is greater in shorter channel devices, but Vt is a function of length even without DIBL.
 
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