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Pinch off Voltage:
The current in N-JFET because of a small voltage VDS is described by:
IDSS = (2a) W/L (qNdμnVDS)
In which2a = channel thickness
In the saturation region:
IDS =IDSS [1- VGS /VP] 2
In the linear region
Or (in terms of IDSS):
ID = 2IDSS/V2P (VGS - VP - VDS/2) VDS
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