A fast circuit requires . . . . . . . . . A. High gm B. Low gm C. Does not depend on gm D. Low cost

The correct answer is A. High gm.

gm is the transconductance of a transistor, which is a measure of how much current it can source or sink for a given change in voltage. A higher gm means that the transistor can switch faster, which is important for high-speed circuits.

Option B is incorrect because a low gm means that the transistor will switch more slowly.

Option C is incorrect because gm does affect the speed of a

Option D is incorrect because