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Lecture #4 BJT AC Analysis - BU

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. Ac Analysis Defining the important parameters of any system.

BJT Transistor Modeling 5 • the ac equivalent of a transistor network is obtained by: 1. Setting all dc sources to zero and replacing them by a short-circuit equivalent 2. Replacing all capacitors by a short-circuit equivalent 3. Removing all elements bypassed by the short-circuit equivalents introduced by steps 1 and 2 4.

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