rds in VGS < VT (depletion)

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harry456

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In the linear region a rds can be descript by rds = 1/(mu Cox W/L (VGS-VTH)). In a mos-cap VDS is equal to zero but what's the value for rds when VGS<VTH oder VGS<0?
 

harry456 said:
In the linear region a rds can be descript by rds = 1/(mu Cox W/L (VGS-VTH)). In a mos-cap VDS is equal to zero but what's the value for rds when VGS<VTH oder VGS<0?
Click to expand...

In such cases you obviously can't use this equation. Instead use
rds = VDS/(mu Cox W/L) = VDS/Id
Click to expand...
For VDS -> 0 --> rds -> ∞
 

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