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Unformatted text preview: Experiment 4: Single Stage BJT Amplifiers: Common Emitter 1 Objective Design and analysis of analog amplifiers is not usually done at the single transistor level, but instead, it is done by grouping together known configurations of single transistor amplifiers to create a new amplifier with just the right properties for the particular application. Such properties include input impedance, gain, and output impedance. However, before presenting to you the analysis and implementation of these robust multi-transistor amplifiers, we will present to you the fundamentals of a single transistor amplifier. The objective of this lab is to teach you about the single stage BJT common emitter (CE) amplifier and all its wonderful properties. The next lab will cover the properties of the common collector (a.k.a. emitter follower) and common base amplifiers. By the end of this lab and the next, you will begin to see why these different configurations are useful and how they can be connected together to fulfill certain design specifications. 2 Materials The items listed in table 1 will be needed. Note: Be sure to answer the questions on the report as you proceed through this lab. The report questions are labeled according to the sections in the experiment. Also, note that there is an accompanying post-lab appended to the end of the lab report. CAUTION: FOR THIS EXPERIMENT, THE TRANSISTORS CAN BECOME EXTREMELY HOT!!! Component Quantity 2N4401 NPN BJT 1 8 Ω speaker 1 1 kΩ resistor 1 10 kΩ resistor 1 10 μ F capacitor 1 10 kΩ potentiometer 1 Table 1: Components used in this lab 3 Procedure Note: All voltages mentioned in the following instructions are the effective voltages delivered, not the one shown on the function generator’s display. This discrepany is further explained in section 3: Voltage Divider Discussion from the function generator tutorial. 3.1 Biasing for Maximum Gain We beginning by finding the proper biasing point for the common emitter (CE) amplifier shown in Figure 1....
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- Spring '08
- Resistor, Input impedance, Bipolar junction transistor, Buffer amplifier, Common base, Grid bias