Discussion
Consider the following pairs of bias arrangement and its distinguishing feature.
Fixed bias - Operating point proportional to beta
Collector feedback - Base drive reduced by rising collector current
Divider with emitter resistor - Operating point set by resistor values
Emitter bypass capacitor - Improves the stability factor
How many of the pairs given above are correctly matched?
Answer: C
The first three are correctly paired and the fourth is not, so three match. The bypass capacitor has no effect on the stability factor at all, since it is an open circuit at direct current; what it improves is the signal gain. Attributing a direct-current benefit to a component that only acts on signals is the standard confusion in this topic, and it is worth checking every time.
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