C.8. Frequency Response of NPN – PNP Amplifier Due to the Base Shunt Capacitor
In the npn – pnp amplifier project, we determine VAFn directly through a gain measurement for a circuit configuration in which (C.51) is valid. The requirement that RBp ≈ 0 will be implemented by shunting the base of the pnp transistor to ground with a capacitor, Cb, as shown in Fig. C.12. The capacitor must be sufficiently large to hold the base at ground at the frequency of the gain measurements.
Figure C.12. Segment of the npn – pnp amplifier of Fig. C.10 showing the addition of a pnp base-bypass capacitor, Cb.
The expression to determine the required value of ...
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