Berkeley ELENG 105 - Single Stage BJT Amplifiers: Common Emitter (3 pages)

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Single Stage BJT Amplifiers: Common Emitter



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Single Stage BJT Amplifiers: Common Emitter

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Pages:
3
School:
University of California, Berkeley
Course:
Eleng 105 - Microelectronic Devices and Circuits
Microelectronic Devices and Circuits Documents

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UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Sciences EE105 Lab Experiments Experiment 4 Single Stage BJT Amplifiers Common Emitter 1 Objective Design and analysis of analog amplifiers is not often done on the individual transistor level but instead by grouping together known configurations of single transistor amplifiers to create a new amplifier with just the right properties for the application Those properties are input impedance gain and output impedance Before analyzing and building these robust multi transistor amplifiers however you must first understand the basics of the single transistor amplifier case The objective of this lab is to familiarize you specifically with the single stage BJT common emitter CE amplifier and all its wonderful properties The next lab will cover the same properties of the common base and common collector a k a emitter follower cases By the end of this lab and the next you will begin to see why these different configurations are useful and how they might be fit together to achieve specific properties 2 Materials Component 2N4401 NPN BJT 8 speaker 1 k resistor 10 k resistor 10 F capacitor 10 k potentiometer Quantity 1 1 1 1 1 1 Table 1 Components used in this lab 3 Procedure 3 1 Biasing for Maximum Gain The properties of a common emitter amplifier are greatly affected by the DC bias point and specific biasing circuitry In this case we are using a voltage source and a pull up resistor to bias the collector and the DC offset on the function generator to bias the base In multi transistor amplifiers however a transistor is generally biased using other transistors to acheive the greatest small signal gain 1 Build the circuit shown in Figure 1 a simple common emitter amplifier with no load attached Let RC 1 k and VCC 5 V Note You may want to use the parameter analyzer test fixture since you ll use ICS to analyze the circuit 2 Using ICS perform a sweep of VIN from 0 V to 1 V



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