the definition of sub-threshold area

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sunjiao3

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Hi, friends. I know that when Vgs get very close to Vth, the operation area is called sub-threshold area. But, is there a clear definition, a water shed on it? I mean, judge by the value of Vth and Vgs. In the *.lis file produced by hspice, the states are only divided into saturati, cutoff and linear. So, how can I decide whether it is subtheshold by the value of Vgs and Vth? Thank you all in advance.
 

hi friends,
sub-threshold area is also called weak invert area,existing when vgs<vth,more generally,the area can be diveded into strong invert,moderate and weak invert.
 

it can depent on your ID.
 

when vgs is just below the Vth then we call it as subthreshold or weak inversion region..
roughly vgs shud be in between vth and vth-5vt where vt=26mv
 

If you want to calculate the threshold voltage this will help you : **broken link removed** , Chapter 7: MOS , 7.4. Threshold voltage
 

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