![]() ![]() 1 we show a very common configuration of base and emitterįigure 1: Basic Single Transistor Amplifierīiasing for the common emitter amplifier configuration. which don’t depend strongly on your accidental choice of a specific transistor. In practical amplifier applications, it is desirable to design a circuit whose properties are predictable, i.e. So far we have been concerned only with the properties of the transistor itself. The difference in value is usually not important. Except for Q-point calculations, the generally more useful quantity is the small signal parameter hfe = dIC/dIB. (c) Compare your measured β = IC/IB to the range given on the spec sheet. In the Appendix we give the specifications for this transistor as listed by the manufacturer. Note also the wide variation between your transistor and those of your neighbors. (b) Be sure to record the appropriate scale readings for your transistor for later anal- ysis. The curve tracer will be used to measure the characteristics of your tran- sistor and to make hard copies for your notebook. (a) Your lab instructor will illustrate the basic principles of operation of the curve tracer. These are diffused junction transistors with a fairly small base current gain. The first step in this experiment is to measure and record the common emitter char- acteristic curves for a silicon NPN 2N1480 transistor. To understand the effect of emitter resistor by-pass (degenerative feedback) through a transresistance analysis.ġ.To distinguish between current and voltage driven base signals.To predict, using the transresistance model, the AC properties of your amplifier circuit and to verify them experimentally. ![]() To use the base current gain (β), and load line analysis to predict and experimentally to verify the DC operating point (often called the “Q point”) for your transistor in the common emitter configuration.To measure and understand the common emitter transistor characteristic curves.Transistor Characteristics and Single Transistor Amplifier ![]()
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