Monday, 2 March 2015

Is operating point calculation the same for P-JFET and N-JFET with voltage-divider bias?


I've seen this calculation of operating point for N-JFET:



Together with the relation \$I_D = I_{DSS}(1-V_{GS}/U_P)^2\$, it is possible to find \$I_D\$ and \$V_{SD}\$.



This method doesn't take into account that it's a N-JFET. Does this mean that the result would be identical for a P-JFET? (I think it is, because we assume that there is no current through the gate, so P/N-ness wouldn't matter.)



Answer



I reckon so: -


enter image description here


Taken from here


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