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The concept of transistor operating points, load lines, and various dc biasing circuits such as fixed bias, emitter stabilized bias, voltage divider bias, and their impact on the stability of the system. It also covers the effect of temperature on transistor parameters and the process of obtaining the ac equivalent of a transistor network.
Typology: Slides
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A line joining the saturation and cut off points is called as Load line. Load line drawn over the output characteristic curve, makes contact at a point called as Operating point. Q-point is selected in such a way that irrespective of AC signal swing, the transistor remains in the active region.
Simplest transistor dc bias configuration DC analysis the network can be isolated from the indicated ac levels by replacing the capacitors with an open-circuit equivalent For DC: DC supply VCC can be separated into two supplies for analysis purposes.
Base–Emitter Loop
Collector–Emitter Loop
Voltage-divider bias configuration DC components of the voltage divider configuration
Shift in dc bias point (Q-point) due to change in temperature
A model is a combination of circuit elements, properly chosen, that best approximates the actual behavior of a semiconductor device under specific operating conditions.
Defining the important parameters of any system Demonstrating the reason for the defined directions and polarities
Output is taken from the emitter terminal of the transistor as shown in Fig. the network is referred to as an emitter- follower
Feedback path from collector to base to increase the stability of the system
Approximate common-emitter hybrid equivalent circuit.
