N_BJT_Sedra_N8 - Bipolar Junction Transistors (BJTs) (08) 1...

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1 Bipolar Junction Transistors (BJTs) (08)
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2 BIPOLAR JUNCTION TRANSISTORS (BJT’s) Introduction 1. Diodes were two terminal devices, whereas BJTs or commonly known transistors are three terminal semiconductor devices. Three terminal devices can be used in more number of applications viz-a-viz two terminal devices. Typical applications could be: a) Signal Amplification b) Design of Digital Circuits c) Design of Memory Circuits. 2. The basic concept is to use the voltage between two terminals to control the current flowing in the third terminal. In this way realization of a “Controlled Source” is achieved through use of a three terminal device.
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3 BIPOLAR JUNCTION TRANSISTORS (BJT’s) Introduction 1. Also, the control signal can cause the current in the third terminal to change from ‘Zero’ to a large value ----- in this case device behaves like a ‘Switch’. 2. Please note that a ‘Switch’ is the basis for the ‘Logic Inverter’ which in turn is the basis of ‘Digital Circuits’. 3.
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This note was uploaded on 01/29/2011 for the course EE 203 taught by Professor Gp.(r)muzaffarali during the Fall '10 term at College of E&ME, NUST.

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N_BJT_Sedra_N8 - Bipolar Junction Transistors (BJTs) (08) 1...

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