ECE 345 Lecture Notes - Lecture 15: Equivalent Circuit
9 Nov 2017
School
Department
Course
Professor
Document Summary
Bipolar junction transistor (bjt): the bipolar junction transistor is a semiconductor three terminal device that has a small current (base current) that controls a large current (collector current). This device can be very useful in amplification applications as well as switching applications. In lecture 14 we considered the n-p-n bjt. An p-n-p bjt and the corresponding circuit symbol. These also follow kirchhoff"s connection constraints such that. Notice, for the voltages, the first subscript corresponds to the + i reference mark as it did with the n-p-n bjt. and v v. The p-n junctions form diodes between the base-and-collector and base-and-emitter. The base region is thin such that current from the collector injected into the base flows all the way through the base to the emitter. The current voltage characteristics of the base-emitter and collector-emitter can be viewed separately as shown in figure 3. veb. Region ib ib4 ib3 ib2 ib1 ib6 ib5 ib4 ib3 ib2 ib.
