I have a simple question about a depletion type jfet current transduction equation. It's from the book "ARRL handbook of radio communications".
Id=Idss(1-Vsg/Vp) ^2
I can't seem to make sense of it, first I'm not sure why its Vsg instead of Vgs. But most importantly if Vsg is the same voltage as Vp the drain current does not come out to be zero. In fact the equation can be simplified to (1/Vp -Vsg/Vp)^2 *Idss
When Vsg=Vp the drain current doesn't equal zero, in fact the smaller Vsg is the larger he drain current, I've seen other equations that make more sense like Idss(1-Vgs/Vp)^2 which makes much more sense.Could someone please help me understand.
Id=Idss(1-Vsg/Vp) ^2
I can't seem to make sense of it, first I'm not sure why its Vsg instead of Vgs. But most importantly if Vsg is the same voltage as Vp the drain current does not come out to be zero. In fact the equation can be simplified to (1/Vp -Vsg/Vp)^2 *Idss
When Vsg=Vp the drain current doesn't equal zero, in fact the smaller Vsg is the larger he drain current, I've seen other equations that make more sense like Idss(1-Vgs/Vp)^2 which makes much more sense.Could someone please help me understand.