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Amplifier Design
168 Chapter Three
Figure 3.70 A Class C amplifier with external bias.
Figure 3.71 A Class C amplifier with self-bias.
scheme that biases the amplifiers at just above cutoff can be used for Class B
operation, such as that shown in the push-pull amplifier circuit of Fig. 3.73
utilizing biasing stabistors. Stabistors are just two series diodes that maintain
an even 0.7 V on each of the transistor’s emitter-base junctions, while also
helping to protect against the destructive effect of thermal runaway. But for
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