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Lecture #4 BJT AC Analysis

Lecture #4 BJT AC Analysis Instructor: Dr. Ahmad El-Banna November 2014 J-601-1448 Electronic Principals Integrated Technical Education Cluster At AlAmeeria Ahmad El-Banna Agenda 2 J-601-1448 , Lec#4 , Nov 2014 Ahmad El-Banna BJT transistor Modeling The re Transistor Model (small signal Analysis ) Effect of RL and Rs & determining the Current Gain Two-Port Systems Approach Cascaded Systems The Hybrid Equivalent Model (Approximate & Complete ) Troubleshooting and Practical Applications BJT TRANSISTOR MODELING 3 J-601-1448 , Lec#4 , Nov 2014 Ahmad El-Banna BJT Transistor Modeling 4 A model is a combination of circuit elements, properly chosen, that best approximates the actual behavior of a semiconductor device under specific operating conditions.

• The dc analysis of npn and pnp configurations is quite different in the sense that the currents will have opposite directions and the voltages opposite polarities. • However, for an ac analysis where the signal will progress between positive and negative values, the ac equivalent circuit will be the same. npn versus pnp J-601-4 l-a

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