FET Fundamentals Unit 4 – JFET Current Source
You may connect a JFET as a constant current source by operating it in its pinch-off region.
The JFET current source studied in this unit uses zero gate bias; the gate and source terminals are
shorted together.
The drain saturation current (IDSS) is constant when VDS exceeds the JFET pinch-off
voltage specification.
NEW TERMS AND WORDS
constant current source - a circuit that supplies a fixed current to a varying load resistance.
drain saturation current (IDSS) - zero gate drain current of a JFET operated in the pinch-off
region.
EQUIPMENT REQUIRED
F.A.C.E.T. base unit
FET FUNDAMENTALS circuit board
Multimeter