Discussion
Consider the following pairs of technique and what it improves.
Cascode - Bandwidth at unchanged gain
Shunt peaking - Bandwidth at some risk of peaking
Dominant-pole compensation - Stability at the cost of bandwidth
Larger coupling capacitor - High-frequency response
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 larger coupling capacitor extends the low-frequency response, since it is in series with the signal, and does nothing at the high end. Three of these techniques act on the high end and one on the low, and sorting them that way is what stops a low-end remedy being applied to a high-end problem.
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