Discussion
Consider the following pairs of design choice and its cost.
Larger emitter resistor - Less output swing
Stiffer divider - More supply current and lower input impedance
Current source load - Extra devices and reduced headroom
Emitter bypass capacitor - Poorer thermal stability
How many of the pairs given above are correctly matched?
Answer: B
The first three are correctly paired and the fourth is not, so three match. The bypass capacitor costs nothing in thermal stability, since it is an open circuit at direct current; its price is a low-frequency limit and the physical size of a large capacitor. Being able to name the cost of each choice as readily as its benefit is what turns a list of techniques into a design method.
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