UW-Madison PHYSICS 623 - Transistor Characteristics and Single Transistor Amplifier (5 pages)

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Transistor Characteristics and Single Transistor Amplifier



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Transistor Characteristics and Single Transistor Amplifier

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Pages:
5
School:
University of Wisconsin, Madison
Course:
Physics 623 - Electronic Aids to Measurement

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Physics 623 Transistor Characteristics and Single Transistor Amplifier Sept 13 2006 1 Purpose To measure and understand the common emitter transistor characteristic curves To use the base current gain 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 predict using the transresistance model the AC properties of your amplifier circuit and to verify them experimentally To distinguish between current and voltage driven base signals To understand the effect of emitter resistor by pass degenerative feedback through a transresistance analysis 2 Procedure 1 Characteristic Curves common emitter The first step in this experiment is to measure and record the common emitter characteristic curves for a silicon NPN 2N1480 transistor These are diffused junction transistors with a fairly small base current gain a Your lab instructor will illustrate the basic principles of operation of the curve tracer The curve tracer will be used to measure the characteristics of your transistor and to make hard copies for your notebook b Be sure to record the appropriate scale readings for your transistor for later analysis Note also the wide variation between your transistor and those of your neighbors In the Appendix we give the specifications for this transistor as listed by the manufacturer c Compare your measured IC IB to the range given on the spec sheet Except for Q point calculations the generally more useful quantity is the small signal parameter hf e dIC dIB The difference in value is usually not important 2 The Q point or DC quiescent point So far we have been concerned only with the properties of the transistor itself In practical amplifier applications it is desirable to design a circuit whose properties are predictable i e which don t depend strongly on your accidental choice of a specific transistor In Fig 1 we show a very common configuration of base and emitter



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