Semiconductor Fundamentals Unit 5 – Transistor Junctions & PNP DC Bias
A transistor is a current-controlling device; the base-emitter junction has to be forward biased for
transistor current to flow. A small change in base current causes a large change in collector
current; this transistor property is current gain. The emitter current is the sum of the base and
collector currents: IE = IB + IC
NEW TERMS AND WORDS
junctions - the points of contact between the emitter and base or the base and collector sections
of a transistor.
PNP - a transistor type that has an N type material sandwiched between two P type materials.
NPN - a transistor type that has P type material sandwiched between two N type materials.
EQUIPMENT REQUIRED
F.A.C.E.T. base unit
SEMICONDUCTOR DEVICES circuit board
Multimeter