Page 170 - Complete Wireless Design

Amplifier Design

Amplifier Design 169

Figure 3.72 A Class B push-pull amplifier.

Figure 3.73 A Class B push-pull
amplifier stabilized with
stabistors.

nonlinear operation, Class B can employ single-ended amplifiers fed into high-
Q tuned RF circuits, with any biasing arrangement that sets the transistor at
approximately 0.7 V above cutoff.

Bias circuit considerations. To reiterate some of the more important aspects
of high-frequency bias design: Any emitter bias resistor and emitter capaci-
tor can create low-frequency instability and bias oscillations, in addition to

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