Lecture 11_ Feb 11 2011

Lecture 11_ Feb 11 2011 - Chapter 13 Small-Signal Modeling...

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Unformatted text preview: Chapter 13 Small-Signal Modeling and Linear Amplification Lecture 11 Covered Sections: 13.2, 13.6, 13.7 Common Emitter Amplifier Coupling and Bypass Capacitors AC coupling through capacitors is used to inject ac input signal and extract output signal without disturbing Q-point Capacitors provide negligible impedance at frequencies of interest and provide open circuits at dc. C 1 and C 3 are large-valued coupling capacitors or dc blocking capacitors whose reactance at the signal frequency is designed to be negligible. C 2 is a bypass capacitor that provides a low impedance path for ac current from emitter to ground, thereby removing R E (required for good Q-point stability) from the circuit when ac signals are considered. Chap 13.2 dc and ac Analysis DC analysis: Find dc equivalent circuit by replacing all capacitors by open circuits and inductors by short circuits. Find Q-point from dc equivalent circuit by using appropriate large- signal transistor model. AC analysis: Find ac equivalent circuit by replacing all capacitors by short circuits, inductors by open circuits, dc voltage sources by ground connections and dc current sources by open circuits. Replace transistor by small-signal model Use small-signal ac equivalent to analyze ac characteristics of amplifier....
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Lecture 11_ Feb 11 2011 - Chapter 13 Small-Signal Modeling...

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