Discussion
What does a lead network contribute?
Answer: D
A lead network adds a zero whose ninety degrees of phase lead offsets a pole's lag, restoring margin without sacrificing crossover frequency. Adding a pole is what a lag network does. It does not raise the low-frequency gain, and input capacitance is unrelated. Because it buys stability without costing bandwidth, a lead network is preferred where speed matters - at the price of needing the zero placed accurately against a pole that may itself move.
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