Chapter 3 1 42 Bipolar Junction Transistors and Applications

Apuntes

Chapter 3 & 4: Bipolar Junction Transistors and Applications © Modified by Yuttapong Jiraraksopakun ENE, KMUTT 2009 Copyright ©2009 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 • All rights reserved. Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis Nashelsky Transistor Construction There are two types of transistors: • pnp • npn The terminals are labeled: • E - Emitter • B - Base • C - Collector pnp npn 2 Copyright ©2009 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 • All rights reserved. Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis Nashelsky Transistor Operation With the external sources, V EE and V CC , connected as shown: • The emitter-base junction is forward biased • The base-collector junction is reverse biased 3 Copyright ©2009 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 • All rights reserved. Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis Nashelsky Currents in a Transistor The collector current is comprised of two currents: B I C I E I + = minority CO I majority C I C I + = Emitter current is the sum of the collector and base...