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Subthreshold conduction !!!

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jeet_asic

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CMOS :

If we reduce threshold voltage , subthreshold conduction increases ??? why ? .. if we reduce Vgs below Vt voltage , current doesn't go to zero abruptly , it falls exponentially. So if i reduce Vt , how Subthreshold conduction increases , it should decrease.:?:
 

Please refer to the Weste & Harris CMOS VLSI Design.
You can find out why subthreshold current increases with Threshold voltage decreasing.
 

Sir , i did explore Weste , but i didn't get clear explanation. I have been looking for this doubt for longtime now. But no success. Sir , can you provide some links or any material which clearly explains the reason.
Oveis.Gharan said:
Please refer to the Weste & Harris CMOS VLSI Design.
You can find out why subthreshold current increases with Threshold voltage decreasing.
Click to expand...
 

Please read the below paper. You can find a lot of thing through the text.
S. K. Gupta, et al., "Digital Computation in Subthreshold Region for Ultralow-Power Operation: A Device–Circuit–Architecture Codesign Perspective," Proceedings of the IEEE, vol. 98, 2010.
Could you access IEEExplore?

Feel free to ask more ...
 
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