File Name: transistor circuit analysis and design .zip
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This chapter presents different linear transistor models suitable for computer aided symbolic circuit analysis. We discuss why a more refined model does not necessarily give a more useful symbolic result. It is also concluded that a simple, or even ideal, transistor model can have great advantages in circuit synthesis.
Till now we have discussed different regions of operation for a transistor. But among all these regions, we have found that the transistor operates well in active region and hence it is also called as linear region. The outputs of the transistor are the collector current and collector voltages. When the output characteristics of a transistor are considered, the curve looks as below for different input values. In the above figure, the output characteristics are drawn between collector current I C and collector voltage V CE for different values of base current I B.
The three different transistor circuit configurations are: common emitter, common base and common collector emitter follower , these three circuit configurations have different characteristics and one type will be chosen for a circuit dependent upon what is required.
In previous parts of this series we reviewed the basic transistor parameters that determine ac voltage gain and practical considerations limiting high gain. The role of a coupling capacitor was introduced. In this section we see how to minimize output loading to maintain high gain along with more practical DC biasing. Minimizing the Output Load Effect It is important to note that the voltage gain at T1 could be heavily influenced by the output load. In Figure 9, yet another transistor T4 is added to act as an output buffer to maintain higher impedance at the collector of the gain stage T1.
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