Discussion
Consider the following pairs of component and its purpose in an output stage.
Bias spreader - Setting the quiescent current
Emitter ballast - Equalising current between devices
Output inductor - Isolating a capacitive load from the loop
Bootstrap capacitor - Blocking direct voltage from the load
How many of the pairs given above are correctly matched?
Answer: A
The first three are correctly paired and the fourth is not, so three match. A bootstrap capacitor lifts the driver's supply with the output to recover swing near the rail; blocking direct voltage is the output coupling capacitor's job in a single-supply design. Two capacitors in one stage doing quite different jobs is easy to conflate, and tracing what each is connected between settles it immediately.
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