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Transcript
JFETs Junction Field Effect Transistors Rick Matthews Department of Physics Wake Forest University Beyond Bipolar • Bipolar transistors (NPN and PNP) require a base current, typically microamps. • Input impedance is limited because the base-emitter junction is forward biased in normal operation. • Forward bias means current. • We can do better. JFETS Current-voltage characteristics Designing an amplifier Load line Summary: JFET vs. BJT • JFET gives higher input impedance than BJTs. • Input current in the nanoamp range or less, much smaller than BJTs. • Power dissipation is less. • Can work to higher frequencies. • Easier to fabricate on ICs than BJTs. • BUT lower voltage gain.
