MOSFET in saturation

Thread Starter

vustudent

Joined Mar 11, 2009
38
Given a MOSFET in saturation, where Vds> Vgs - Vth and there is pinch off in the at the drain side of the channel, why would there still be a constant current? Even when the channel has physically disappeared?
 

Ghar

Joined Mar 8, 2010
655
The channel doesn't physically disappear, it's just very constrained. This is why it's constant current - you're trying to drive more current than the channel can support therefore you get the maximum it can support.
 
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