Why does the current stop at pinch voltage in a JFET?

nhrock3 · Jun 7, 2010

Hebrew slide on JFET pinch-off: V_DS = V_DS(sat) heading, text on pinch-off at the channel width, V_p at V_GS=0, a sketch of I_D against V_DS with a red point marking V_DS(sat), and a JFET cross-section with gate G, source S, drain D, depletion region and width W=a.

i thought that as we increase the voltage the gap becomes smaller
and in pinch voltage we have an open circuit

but the grath says otherwise
that as we increase the voltage the current increases and in the pinch voltage (when there is no way for the electrons to move and we have a total deplition region on one side)
we have a saturation
and there is no decrease in current no where
why?

nhrock3 · Jun 7, 2010

in here
http://www.learnabout-electronics.org/fet_03.php
when i increase the Vdc the current stop
no matter what in the Vgs

Why does the current stop at pinch voltage in a JFET?

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