C.6. Selection of Coupling Capacitors
External capacitors are added to the circuits of this unit for two purposes. One, shown in Fig. C.1(b), is to connect the signal input source to the amplifier. The other is a special-purpose capacitor of the amplifier project. It is attached to facilitate measurement of the base – emitter voltage with high resolution. Design considerations for selection of the capacitor values are discussed in the following.
C.6.1. Coupling Capacitor for the Common-Emitter Amplifier
The linear equivalent circuit of the amplifier of Fig. C.1(b) is shown in Fig. C.6. The selection of the value of the capacitor Cb is based on the requirement that it has negligible effect on the signal current at any frequency at which the ...
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